I joined Facebook in November of 2007. Through Facebook I’ve reconnected with old friends and maintained connections with new ones. It’s replaced my personal email account (which my employer has so thoughtfully blocked from company computers). I haven’t liked every interface change, but it’s still far more useful a social networking platform than anything else (Myspace? Really?).
I don’t really have much of a problem with Facebook sharing my information to target ads, given I don’t actually have to pay for Facebook. I’m pretty sure the goal is to make a little money, and if that’s what it takes, so be it. I wouldn’t be surprised to see an option in the future that allows users to pay for privacy. But for now, it doesn’t bother me so much. I don’t blame anyone who doesn’t like it, though.