NEW YORK--(BUSINESS WIRE)--WPP's (NASDAQ:WPPGY) Data Alliance, the company that supports "data horizontality" across the Group by increasing access and empowering data-driven thinking, announced a global partnership today to provide all WPP operating companies with streamlined access to eMarketer’s global database of digital marketing research data. This partnership represents another step in WPP’s mission to enrich client work with the best data available, including highly valuable sources of