Network of friends = lock in, lock in => abuse
Bingo! Facebook is the best available means of keeping up with geographically distributed and loosely connected friends and family, which was the core conflict I faced when I decided I didn't like how I was being treated by Zuckerberg, et al.
I resolved it internally when I realized that they were essentially holding my relationships hostage to get what they want out of me. After that it was easy to leave.