Today, I deactivated my Facebook account. It may not last--some friends won't be happy with this--but I've toyed with the idea for a while.
While Facebook can be great for reconnecting with people you haven't seen in years and keeping tabs on others, it's a huge time drain. Yes, I could just limit my use of it, but that doesn't really happen, even when I tell myself it will. It's like a Siren, calling me to crash on the rocks of wasted time. I definitely have better things to do.
Also, friends who I know don't mean harm (I know them in real life, so I know them well enough to be sure) post things that upset me. Why would I want more of that? So it was time to shut it down. The negatives outweigh the positives. Who needs that?