Do they own the data they trick out of you, when your browser sends a request to Facebook for every page with a 'like' button or similar feature unless you're doing crazy-adblock?
Do they own any data your friends and relatives give them about you?
Are you going to pretend that there is much difference between owning it and having a license to use it however they want?
Your last point is noted, hence why I do not use their site... It's the most interesting point in that most people never think about it. That's why Facebook is evil.
And pay close attention here: "Facebook only has access to information you give it". Think about that for a second.