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  <xsd:element id="vclk_BusinessAcquisitionEquityInterestIssuedOrIssuableValueAssumed" name="BusinessAcquisitionEquityInterestIssuedOrIssuableValueAssumed" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="vclk_BusinessAcquisitionPurchasePriceAllocationAccountsReceivableAndOtherAssetsAcquired" name="BusinessAcquisitionPurchasePriceAllocationAccountsReceivableAndOtherAssetsAcquired" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="vclk_BusinessAcquisitionUnvestedRestrictedStockAssumedShares" name="BusinessAcquisitionUnvestedRestrictedStockAssumedShares" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="duration" />
  <xsd:element id="vclk_BusinessAcquisitionUnvestedStockOptionsAssumedShares" name="BusinessAcquisitionUnvestedStockOptionsAssumedShares" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="duration" />
  <xsd:element id="vclk_BusinessAcquisitionsPercentageOfAssetsAndLiabilitiesIncludingGoodwillRecordedAtFairValue" name="BusinessAcquisitionsPercentageOfAssetsAndLiabilitiesIncludingGoodwillRecordedAtFairValue" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="vclk_BusinessCombinationsProFormaResultsTable" name="BusinessCombinationsProFormaResultsTable" nillable="true" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="vclk_CapitalizationAbstract" name="CapitalizationAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="vclk_CommitmentsAndContingenciesAbstract" name="CommitmentsAndContingenciesAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="vclk_CommonStockDividendsPerShareDeclaredPurchaseRight" name="CommonStockDividendsPerShareDeclaredPurchaseRight" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="vclk_CompositionOfNoteReceivableAbstract" name="CompositionOfNoteReceivableAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="vclk_ConcentrationOfCreditRiskAndSignificantCustomersPolicyPolicyTextBlock" name="ConcentrationOfCreditRiskAndSignificantCustomersPolicyPolicyTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element id="vclk_CorporateExpenses" name="CorporateExpenses" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="vclk_CorporateMember" name="CorporateMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="vclk_CostReclassificationMember" name="CostReclassificationMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="vclk_CostReclassificationsAndCorrectionsPolicyTextBlock" name="CostReclassificationsAndCorrectionsPolicyTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="vclk_CreditAgreementAbstract" name="CreditAgreementAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="vclk_CustomerAffiliateAndAdvertiserRelationshipsMember" name="CustomerAffiliateAndAdvertiserRelationshipsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="vclk_DeferredTaxAssetsDiscountOnNote" name="DeferredTaxAssetsDiscountOnNote" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="vclk_DeferredTaxAssetsPropertyPlantAndEquipmentAndIntangibles" name="DeferredTaxAssetsPropertyPlantAndEquipmentAndIntangibles" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="vclk_DevelopedTechnologiesAndWebsitesMember" name="DevelopedTechnologiesAndWebsitesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="vclk_DiscontinuedOperationsAbstract" name="DiscontinuedOperationsAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="vclk_DiscontinuedOperationsDisclosureAbstract" name="DiscontinuedOperationsDisclosureAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="vclk_DispositionDetailsAbstract" name="DispositionDetailsAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="vclk_DocumentAndEntityInformation" name="DocumentAndEntityInformation" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="vclk_DotomiIncAndGreystripeIncAcquisitionMember" name="DotomiIncAndGreystripeIncAcquisitionMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="vclk_DotomiIncMember" name="DotomiIncMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="vclk_EffectiveIncomeTaxRateReconciliationLapseOfStatuteOfLimitations" name="EffectiveIncomeTaxRateReconciliationLapseOfStatuteOfLimitations" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element id="vclk_EmployeeServiceShareBasedCompensationNonvestedAwardsWeightedAverageRemainingVestingPeriod" name="EmployeeServiceShareBasedCompensationNonvestedAwardsWeightedAverageRemainingVestingPeriod" nillable="true" substitutionGroup="xbrli:item" type="us-types:durationStringItemType" xbrli:periodType="duration" />
  <xsd:element id="vclk_EmployeeStockPurchasePlanCompensationExpense" name="EmployeeStockPurchasePlanCompensationExpense" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="vclk_EmployeeStockPurchasePlanDiscountFromMarketPriceLowerOfOfferingDateOrSpecifiedPurchaseDate" name="EmployeeStockPurchasePlanDiscountFromMarketPriceLowerOfOfferingDateOrSpecifiedPurchaseDate" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="vclk_EmployeeStockPurchasePlanMember" name="EmployeeStockPurchasePlanMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="vclk_EmployeeStockPurchasePlanNonvestedAwardsTotalCompensationCostNotYetRecognized" name="EmployeeStockPurchasePlanNonvestedAwardsTotalCompensationCostNotYetRecognized" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="vclk_EmployeeStockPurchasePlanSharesInPlan" name="EmployeeStockPurchasePlanSharesInPlan" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="instant" />
  <xsd:element id="vclk_EmployeeStockPurchasePlanTermOfOfferingPeriod" name="EmployeeStockPurchasePlanTermOfOfferingPeriod" nillable="true" substitutionGroup="xbrli:item" type="us-types:durationStringItemType" xbrli:periodType="duration" />
  <xsd:element id="vclk_EmployeeStockPurchasePlanUnrecognizedCompensationCostsOnEmployeeStockPurchasePlanWeightedAveragePeriodOfRecognition" name="EmployeeStockPurchasePlanUnrecognizedCompensationCostsOnEmployeeStockPurchasePlanWeightedAveragePeriodOfRecognition" nillable="true" substitutionGroup="xbrli:item" type="us-types:durationStringItemType" xbrli:periodType="duration" />
  <xsd:element id="vclk_ExchangeOfStockNumberOfTimesAmountReceivedPerShareOfCommonStock" name="ExchangeOfStockNumberOfTimesAmountReceivedPerShareOfCommonStock" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="vclk_FairValueMeasurementsAbstract" name="FairValueMeasurementsAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="vclk_FederalFundsMember" name="FederalFundsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="vclk_FinancialCovenantsAmount" name="FinancialCovenantsAmount" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="vclk_FurnitureAndEquipmentMember" name="FurnitureAndEquipmentMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="vclk_GeographicInformationAbstract" name="GeographicInformationAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="vclk_GoodwillAndIntangibleAssetsAbstract" name="GoodwillAndIntangibleAssetsAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="vclk_GoodwillPercentageEstimatedFairValuesExceededCarryingValuesBy" name="GoodwillPercentageEstimatedFairValuesExceededCarryingValuesBy" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="vclk_GoogleMember" name="GoogleMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="vclk_GreystripeIncAcquisitionMember" name="GreystripeIncAcquisitionMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="vclk_IncomeStatementLocationAxis" name="IncomeStatementLocationAxis" nillable="true" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="vclk_IncomeStatementLocationDomain" name="IncomeStatementLocationDomain" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="vclk_IncomeTaxesAbstract" name="IncomeTaxesAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="vclk_IncomeTaxesDisclosureAbstract" name="IncomeTaxesDisclosureAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="vclk_IncreasedAuthorizationShareRepurchaseMember" name="IncreasedAuthorizationShareRepurchaseMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="vclk_IntangibleAssetsAbstract" name="IntangibleAssetsAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="vclk_InterestIncomeAndOtherNet" name="InterestIncomeAndOtherNet" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="vclk_InterestRateOnNoteReceivable" name="InterestRateOnNoteReceivable" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="vclk_InvestopediaComAcquisitionMember" name="InvestopediaComAcquisitionMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="vclk_LiborMember" name="LiborMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="vclk_LiquidationPaymentNumberOfTimesPaymentPerShareOfCommonStock" name="LiquidationPaymentNumberOfTimesPaymentPerShareOfCommonStock" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="vclk_MediaMember" name="MediaMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="vclk_NetIncomePerCommonShareAbstract" name="NetIncomePerCommonShareAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="vclk_NetIncomePerCommonShareDisclosureAbstract" name="NetIncomePerCommonShareDisclosureAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="vclk_NoteReceivableAbstract" name="NoteReceivableAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="vclk_NoteReceivableDisclosureAbstract" name="NoteReceivableDisclosureAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="vclk_NoteReceivableFaceAmount" name="NoteReceivableFaceAmount" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="vclk_NotesLoansAndFinancingReceivableNetOfDiscount" name="NotesLoansAndFinancingReceivableNetOfDiscount" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="vclk_NotesReceivableSaleOfBusinessUnitAxis" name="NotesReceivableSaleOfBusinessUnitAxis" nillable="true" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="vclk_NumberOfBusinessDaysFollowingOfferWhichResultsInBidderBeneficialOwnership" name="NumberOfBusinessDaysFollowingOfferWhichResultsInBidderBeneficialOwnership" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="duration" />
  <xsd:element id="vclk_NumberOfBusinessSegments" name="NumberOfBusinessSegments" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="instant" />
  <xsd:element id="vclk_NumberOfMajorCustomers" name="NumberOfMajorCustomers" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="instant" />
  <xsd:element id="vclk_NumberOfMarketableSecuritiesHeld" name="NumberOfMarketableSecuritiesHeld" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="instant" />
  <xsd:element id="vclk_NumberOfRightsEntitledToHolderOfUnexercisedRights" name="NumberOfRightsEntitledToHolderOfUnexercisedRights" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="duration" />
  <xsd:element id="vclk_NumberOfUnitsEachRightEntitlesHolderToPurchase" name="NumberOfUnitsEachRightEntitlesHolderToPurchase" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="vclk_OrganizationAndSummaryOfSignificantAccountingPoliciesAbstract" name="OrganizationAndSummaryOfSignificantAccountingPoliciesAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="vclk_OwnedAndOperatedWebsitesMember" name="OwnedAndOperatedWebsitesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="vclk_PortionOfShareRepresentingUnitHolderIsEntitledToPurchase" name="PortionOfShareRepresentingUnitHolderIsEntitledToPurchase" nillable="true" substitutionGroup="xbrli:item" type="xbrli:decimalItemType" xbrli:periodType="instant" />
  <xsd:element id="vclk_PreferredStockDividendsPerShareNumberOfTimesDividendDeclaredPerShareOfCommonStock" name="PreferredStockDividendsPerShareNumberOfTimesDividendDeclaredPerShareOfCommonStock" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="duration" />
  <xsd:element id="vclk_PreferredStockPricePerUnit" name="PreferredStockPricePerUnit" nillable="true" substitutionGroup="xbrli:item" type="us-types:perUnitItemType" xbrli:periodType="instant" />
  <xsd:element id="vclk_PreferredStockVotingRightsPerShare" name="PreferredStockVotingRightsPerShare" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="vclk_PropertyAndEquipmentAbstract" name="PropertyAndEquipmentAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="vclk_PropertyAndEquipmentDisclosureAbstract" name="PropertyAndEquipmentDisclosureAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="vclk_ProvisionForDoubtfulAccountsAndSalesCredits" name="ProvisionForDoubtfulAccountsAndSalesCredits" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="vclk_ReceivableSaleOfBusinessUnitDomain" name="ReceivableSaleOfBusinessUnitDomain" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="vclk_RecentBusinessCombinationsAbstract" name="RecentBusinessCombinationsAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="vclk_RecentBusinessCombinationsDisclosureAbstract" name="RecentBusinessCombinationsDisclosureAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="vclk_RelatedPartyTransactionOwnershipPercentageByDirectorInRelatedPartyCompany" name="RelatedPartyTransactionOwnershipPercentageByDirectorInRelatedPartyCompany" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="vclk_ReportingUnitsMember" name="ReportingUnitsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="vclk_ScheduleIiValuationAndQualifyingAccountsAbstract" name="ScheduleIiValuationAndQualifyingAccountsAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="vclk_ScheduleOfAmortizationExpenseOfAcquiredFiniteLivedIntangibleAssetsTableTextBlock" name="ScheduleOfAmortizationExpenseOfAcquiredFiniteLivedIntangibleAssetsTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element id="vclk_ScheduleOfDepreciationAndAmortizationIncludedInSegmentIncomeFromOperationsTableTextBlock" name="ScheduleOfDepreciationAndAmortizationIncludedInSegmentIncomeFromOperationsTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="vclk_ScheduleOfEarningsPerShareBasicAndDilutedByCommonClassTable" name="ScheduleOfEarningsPerShareBasicAndDilutedByCommonClassTable" nillable="true" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="vclk_ScheduleOfEarningsPerShareBasicAndDilutedLineItems" name="ScheduleOfEarningsPerShareBasicAndDilutedLineItems" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="vclk_SegmentGeographicalOtherCountriesMember" name="SegmentGeographicalOtherCountriesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="vclk_SegmentGeographicalUnitedKingdomMember" name="SegmentGeographicalUnitedKingdomMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="vclk_SegmentGeographicalUnitedStatesMember" name="SegmentGeographicalUnitedStatesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="vclk_SegmentOperatingIncomeLoss" name="SegmentOperatingIncomeLoss" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="vclk_SegmentsAndGeographicInformationAbstract" name="SegmentsAndGeographicInformationAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="vclk_SegregatedFinancialInformationAbstract" name="SegregatedFinancialInformationAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="vclk_ShareBasedCompensationArrangementByShareBasedPaymentAwardAssumedOptionsFromBusinessCombinations" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardAssumedOptionsFromBusinessCombinations" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="duration" />
  <xsd:element id="vclk_ShareBasedCompensationArrangementByShareBasedPaymentAwardAssumedOptionsWeightedAverageExercisePrice" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardAssumedOptionsWeightedAverageExercisePrice" nillable="true" substitutionGroup="xbrli:item" type="num:perShareItemType" xbrli:periodType="duration" />
  <xsd:element id="vclk_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAssumedAwards" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAssumedAwards" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="duration" />
  <xsd:element id="vclk_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAssumedAwardsWeightedAverageGrantDateFairValue" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAssumedAwardsWeightedAverageGrantDateFairValue" nillable="true" substitutionGroup="xbrli:item" type="num:perShareItemType" xbrli:periodType="duration" />
  <xsd:element id="vclk_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedIntrinsicValueAmount" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedIntrinsicValueAmount" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="vclk_ShareBasedCompensationArrangementByShareBasedPaymentAwardGrantsInPeriodExcludingOptionsAssumedWeightedAverageGrantDateFairValue" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardGrantsInPeriodExcludingOptionsAssumedWeightedAverageGrantDateFairValue" nillable="true" substitutionGroup="xbrli:item" type="num:perShareItemType" xbrli:periodType="duration" />
  <xsd:element id="vclk_ShareBasedCompensationArrangementByShareBasedPaymentAwardGrantsInPeriodOptionsAssumedWeightedAverageGrantDateFairValue" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardGrantsInPeriodOptionsAssumedWeightedAverageGrantDateFairValue" nillable="true" substitutionGroup="xbrli:item" type="num:perShareItemType" xbrli:periodType="duration" />
  <xsd:element id="vclk_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesReservedForIssuancePeriodIncreaseDecrease" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesReservedForIssuancePeriodIncreaseDecrease" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="duration" />
  <xsd:element id="vclk_StandbyLettersOfCreditExpiration" name="StandbyLettersOfCreditExpiration" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="vclk_StandbyLettersOfCreditExpirationAfterFiveYears" name="StandbyLettersOfCreditExpirationAfterFiveYears" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="vclk_StandbyLettersOfCreditExpirationLessThanOneYear" name="StandbyLettersOfCreditExpirationLessThanOneYear" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="vclk_StandbyLettersOfCreditExpirationOneYearToLessThanThreeYears" name="StandbyLettersOfCreditExpirationOneYearToLessThanThreeYears" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="vclk_StandbyLettersOfCreditExpirationThreeYearsToLessThanFiveYears" name="StandbyLettersOfCreditExpirationThreeYearsToLessThanFiveYears" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="vclk_StockBasedCompensationAbstract" name="StockBasedCompensationAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="vclk_StockBasedCompensationContinuingOperations" name="StockBasedCompensationContinuingOperations" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="vclk_StockOptionsAssumed" name="StockOptionsAssumed" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:periodType="duration" />
  <xsd:element id="vclk_StockRepurchaseProgramAdditionalAuthorizedAmount" name="StockRepurchaseProgramAdditionalAuthorizedAmount" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="vclk_SubsidiaryWebMarketingHoldingsLlcMember" name="SubsidiaryWebMarketingHoldingsLlcMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="vclk_TechnologyExpense" name="TechnologyExpense" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="vclk_TechnologyExpensePolicyPolicyTextBlock" name="TechnologyExpensePolicyPolicyTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="vclk_TechnologyMember" name="TechnologyMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="vclk_TermLoanMember" name="TermLoanMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="vclk_TermOfNoteReceivable" name="TermOfNoteReceivable" nillable="true" substitutionGroup="xbrli:item" type="us-types:durationStringItemType" xbrli:periodType="duration" />
  <xsd:element id="vclk_TermOfPaymentAmortizationPeriod" name="TermOfPaymentAmortizationPeriod" nillable="true" substitutionGroup="xbrli:item" type="us-types:durationStringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="vclk_TotalRevenueMember" name="TotalRevenueMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="vclk_TrademarksTradeNamesAndDomainNamesMember" name="TrademarksTradeNamesAndDomainNamesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="vclk_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpenseAssumedInAcquisition" name="UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpenseAssumedInAcquisition" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="vclk_UnrecognizedTaxBenefitsIncreasesResultingFromAcquisition" name="UnrecognizedTaxBenefitsIncreasesResultingFromAcquisition" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="vclk_UnrecognizedTaxBenefitsMeasurementResultingFromSettlementsWithTaxingAuthorities" name="UnrecognizedTaxBenefitsMeasurementResultingFromSettlementsWithTaxingAuthorities" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="instant" />
  <xsd:element id="vclk_UnrecordedUnconditionalPurchaseObligationDueInOneYearToLessThanThreeYears" name="UnrecordedUnconditionalPurchaseObligationDueInOneYearToLessThanThreeYears" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="vclk_UnrecordedUnconditionalPurchaseObligationDueInThreeYearsToLessThanFiveYears" name="UnrecordedUnconditionalPurchaseObligationDueInThreeYearsToLessThanFiveYears" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="vclk_UnremittedEarningsInForeignInvestment" name="UnremittedEarningsInForeignInvestment" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="vclk_VariableInterestByTypeAxis" name="VariableInterestByTypeAxis" nillable="true" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="vclk_VariableInterestByTypeDomain" name="VariableInterestByTypeDomain" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="vclk_WebMarketingHoldingsLlcMember" name="WebMarketingHoldingsLlcMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="vclk_WriteOffOfFullyAmortizedIntangibleAsset" name="WriteOffOfFullyAmortizedIntangibleAsset" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="vclk_YahooMember" name="YahooMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="vclk_YearBalloonPaymentIsDue" name="YearBalloonPaymentIsDue" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="instant" />
</xsd:schema>
