Customer Match will enable advertisers to get to us via our email addresses, which can be matched to signed-in users of its search engine, Gmail or YouTube. Google will accomplish the customer matching by cross-referencing brands email lists with those of people in Google accounts. The tool will enable marketers to target ads to their existing customers and, according to the Wall Street Journal, will potentially enable them to take customers purchase histories or other information into account when tailoring their marketing. Google is only letting brands target email addresses that theyve directly received from people no buying lists of third-party vendors.”]