You definitely have a good point here. Facebook sucks so much of our time, attention and really, I think, can be harmful to real-life relationships.
No time for your friends? No need to make time - just post on their wall and call it a day!
Long-lost high school "friend" wants to add you even though they barely spoke to you 10 years ago? Cool!
I've thought about leaving FB but I don't know if I really want to right now. Am I addicted? I do think so. Sigh.