Company: Google, Yahoo

The Grey Lady reports that Gmail stands accused of "improperly scann[ing] contents of Gmail messages in order to serve ads to its customers." What Google is accused of (and kind of has admitted to doing) is a trick that spammers and virus scans have been using for years. In fact, Google calls it part of their "ordinary course of business." What are they up to exactly? They are scanning your messages for key words that result in ads tailored to you. So, if you've been wondering why so many porno and male enhancement ads have been popping up in your sidebar, it turns out you have no one to blame but yourself.