On September 28, 2015, Google announced a significant new AdWords targeting feature:
Customer Match. AdWords advertisers can now more precisely target their audience based on email addresses instead of the queries they put into the search box or the topics of the article they are reading. When a user gives out his email address because of online activities like subscribing to newsletters, signing up for an account, or making purchases, a company can upload this email and show ads to him whenever and wherever he is using Google Search, YouTube, or Gmail.
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