I just think there should be a distinction between social media for you and your family and friends, and an online community of random people who happen to share the same passions. It's not the same. I know you can make your profile and status updates private only to friends etc, but then you get all the constant nagging of people asking to be your friend and even if you don't feel bad denying them all, it's still annoying that they constantly pop up. That's not what Facebook is to me and I'm almost forced to use it that way now.
Some days I come really close to closing my account altogether because of it. But I want to remain in the community and there aren't so many ways to do that now.