Also, Facebook’s friends

 

Facebook’s advertising partners are keeping track of what you click and when. It’s illegal for Facebook to share “personally identifying information” with its advertisers, but it’s also tricky to define “personally identifying information.” Advertisers receive unspecified user data from Facebook that could include almost any level of detail. Also, all those games you play and all the websites that allow you to share hilarious pictures and videos of cats being just adorable? Those websites can and do track you by name and IP address. While you share LOLcats with your friends, Facebook’s affiliates and partners share your information with their friends.