I know, Facebook isn’t alone in collecting and collating data on people. But they’re the most obnoxious about it, and the only ones known to keep collecting data on people even after they’ve been told to piss off. Someone tagged me in a photo on Facebook once, so Facebook ‘helpfully’ emailed me about how I should log in to the account they created for me and see who else had tagged me, etc etc. My only option was to tell them to stop emailing me about it; there was no option to delete the account, or to stop them from collecting and using information about me.
 I’m actually in the process of breaking my Google Habit as much as possible: “customized” results for searches are just about useless–I actually had one customized result that hid the result I was looking for–and while Google+ does a lot of things better than Facebook, they also do some really annoying stuff like not let me turn chat off, and have taken the “minimalist interface” theory to absurd extremes.