Stop finding excuses to stay on Facebook. Be strong and do what is right. You can convince your friends to use other things if they are truly your friends.
Group SMS is some next-level shit and my friends still talk to me, I swear. It's cool, I don't have to rub my life in their face with life event posts before I talk to them. When I talk to them, I get to catch up with their life and build a relationship like normal humans used to do.