&gt;Don&#x27;t want Facebook to use your personal data to sell you ads? Don&#x27;t put it on Facebook.<p>The problem is that simply using Facebook gives them tons of personal information. They know who your friends are, who you talk to, what articles interest you from what you click, what websites you visit from the embedded Like buttons, and on and on. And this is without adding a single bit of explicit information about yourself to your profile. Facebook probably already knows what school you went to anyway, based on your friends.