> There is certain information (address, account numbers, ss #, etc.) that if obtained by a third party, could result in some real world problems that will negatively impact my life. But information social networks sell to advertisers doesn't fall into this category.<p>That's both wrong and incredibly short-sighted.<p>First, Facebook collects way more data than necessary. In fact, they try to collect data of people <i>which aren't Facebook users</i>. And what's more, in some cases (facial recognition), <i>there's nothing you can do against it</i>. But wait, you can! Guess how? By <i>registering on Facebook</i>, to remove tags. I don't know what to call this, but it feels awfully similar to extortion.<p>Second, the unnecessary data that Facebook collects is dangerous by virtue of existing. Yes, that data might be safe now. We cannot guarantee this to be true tomorrow, next month or in five years, actually, we cannot even be sure if it is safe right now (which is a matter of transparency again). Besides, I don't see how a detailed (which might be an understatement) biography of my life is necessary to sell targeted ads.<p>Third, as rwolf pointed out in another comment, it's not like targeted ads are the only option. Yes, it might be the best alternative in terms of making profit, but we cannot ignore the side effects.<p>Besides, I seriously ask myself when in the hell "profit" became an argument to infringe on basic rights and liberties (of which privacy and control over your own data is - or at least should always be - part of). To present a hyperbole: slavery was very profitable as well. I don't see people arguing that we should allow slavery again.