Data processing services in the nature of customer data onboarding, namely, matching of offline customer data to online devices, appending data to customer records for matching purposes, and matching data related to the same consumer across different touchpoints for others; data activation; data processing services in the nature of offline sales measurement, namely, matching offline sales data to online impression data for others; data analytics; advertising services, namely, digital channel and messaging campaign mix optimization services; advertising services, namely, customer-facing on-line content optimization; market analysis and research services, namely, customer targeting for others; customer relationship management, namely, customer targeting for others; advertising services, namely, advertising message suppression services for others; advertising services, namely, conducting look-alike modeling for customer prospects for others; management of advertising, namely, conducting multi-channel integrated customer message campaigns; advertising services for others, namely, presentation of relevant product offers and messages to customers without the requirement of customer log-in; advertising services for others, namely, tailoring of customer messages based on past purchases; market research, namely, customer analytics; market research, namely, attribution analysis on sales for others; market research, namely, providing website and physical site analytics based on audience segments for messages; market research, namely, analyzing customer messages for determining messages creating the highest impact on conversions per audience segment; marketing services for both advertisers and publishers, namely, providing people-based audience building, targeting, frequency capping, and measurement through control of first-party data in an interoperable and cookieless ecosystem