My suggestion is don't. They word their license agreements giving them technical ownership of anything written in it. That way if they say delete your information they say they were only dealing with their own property its kinda disgusting.
Spok and the anti-Google hate. I have an account, but haven't seen anything it does that's overly interesting nor have I delved into it's features. That said I would trust Google more with my personal data then Facebook...But then I don't have a 'real' Facebook account since I faked it all but needed it for 'social networking with my co-workers according to School Administration'.
Facebook is currently just as bad. It wasn't when I signed up but if you agree to or even decline instead of canceling out of some of the advanced security features it starts using any device you use to connect with Facebook to track you. They even openly admit it. They use the Wifi access points around you so they can send you advertising for businesses you pass! I'm sorry but I don't like companies that want to know my every move. Even if I do use them that doesn't mean I trust them.
Read the entire license agreements and make your own decision but don't put anything on either one that you would want to retain ownership of.
The tracking thing isn't what scares me. Facebook and Google+ have the ability to ruin lives due to drunk posting, inappropriate pictures, and how cross-referenced it makes everything. That's the scary part. Tracking for ads is a silly worry. They don't use GPS they use a cell tower or at best Wifi triangulation/IP central office location and that is by no means exact. Having that tracked unless you've really got something to hide shouldn't be the thing to worry about.
So you are saying because it can be inaccurate in rural areas you don't care that they keep a log of all the locations basically making a history of all your travels with any wireless device you use to access Facebook?
Not exactly. Just saying that you can if you don't mind Google owning it and helping enforce other peoples copyrights if it ever gets mentioned to them. Including all fines the legal system says that should entail.