If I could upvote this comment twice, I would. This succinctly summarises my views on the subject. We shouldn't have to justify _why_ we don't want our private information harvested by these companies. I would still feel remarkably uneasy even _if_ Facebook and Google were demonstrably benevolent citizens of the online world, but we've seen time and time again how invasive and malicious they can be. The fact that both of these companies have political ambition makes the entire situation much scarier. Count me out.