1. As a public opinion board. I post a question on my wall and people answer.
2. Chatting with my friends.
3. One Facebook group where me and my friends are in.
This is my setup to not get completely sucked into Facebook:
1. I changed my real accounts name to a fictional name that is related to my name. I changed my lastname to a French version of it (my lastname is a noun) and then I swapped my first and lastname. So anyone who Google's me on my real name can't find me.
2. I created a fake account with my real name and a modicum amount of friends (at random) in order to not get detected by Facebook that it is a fake account. I put the best pictures of me on this account. Now when people Google me, they see nice pictures.
3. My main browser has my fake account on auto-login. But it has my actual account on the auto-login of Messenger. This means when I go to Messenger, I can actually chat. And when I get nonsense (e.g. login with Facebook or sucked into some feature of Facebook) I get my fake account. Since it has a modicum of friends that I don't care about and nothing on it, there is not much I can do.
4. I set my main Facebook account on auto-login on my second browser. In this way I can still write wall posts and post/read about stuff in my Facebookgroup. Also, I installed a wall eridactor plugin.
I don't think I'll ever be able to completely get away from Facebook, but I am trying my best to keep its use to the things I want to do with it.