I'm not overmuch worried about Facebook, because reasonable people don't treat it as at all private. Sure, it could stand to be a little more memetic that what goes on the Internet becomes immortal, but if, say, someone discovered that any person with an Internet connection had access to their profile, their reaction would probably not be flustered outrage. There exist social networks for minority communities that profess to keep their users' information private, but which are actually about as secure as Facebook itself; that's a problem.
Every person who uses the internet chooses how much information to put there. There are a lot of solutions to the problem of one's data being used for unwanted purposes, such as attaching different accounts to different email addresses/IPs or just keeping it private. This kind of information sharing tech is without precedent, but not actively concerning to me except where users are misinformed about how private their information is.
This article let's me know I'm not the only one concerned at the dominance of companies like Google and Facebook. I don't have enough data or information to judge whether my continued use of these services are going to be detrimental to me or the rest of humanity. What I do know is that increasingly I'm feeling like Facebook and Google know too much about me and have too much of my attention. I feel a little bit like a puppet, a little bit strung along. How do others here feel?
It reminds me or is analogous to this. In my opinion the food industry having a monopoly on what we eat, just as Google and Facebook will have a monopoly web content. Is this a risk on society?