Google, Inc. (NASDAQ: GOOG) continues to make billions in revenue each quarter on the back of its extensive text advertising network used on various Google properties as well as partner websites. The argument can still be made that the large majority of Google's income rests on the back of those simple ads which can be eerily relevant and lucrative for those who advertise on Google's network. One area, though, that has fallen by the wayside in recent years is the importance of Google ads in its Gmail email service.Although competitor Yahoo, Inc. (NASDAQ: YHOO) still has a larger customer base of email users, Google's Gmail product counts tens of millions of global, more affluent users. Although the company gives almost all its products away for free, you won't see advertising inside most of them.
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