Recently, some people took exception to Google’s targeting of ads to Gmail users and filed a class action lawsuit suing Google for the violation of privacy. Google is able to offer Gmail for free because of its robust advertising revenue source. In fact, Google earned more than $50 billion in ad revenues in 2013 – an impression 16% increase over 2012. The Google Display Network, the largest display media network in the world, is successful due in part to the large number of publishers in the network and its targeting options for advertisers. More targeted ads receive more clicks, which pleases advertisers and results in more revenue for ad publishers. To help serve more targeted ads to users, Google automatically scans the content of emails for keywords that are used to display relevant advertising across the Google Display Network.