Only facebook. I seldom write anything on it, for me its mostly due to groups to stay in touch with people I work with.
Instagram, twitter and other direct link functions are of zero interest to me, my opinions and pictures and life in general are not that exciting for the whole world, I guess I don't need it in my life.
I'd rather sit down with some nice music on, brew a massive cup of tea or coffee and sit down and write. 
I often think about this when I watch people on the tube, on the bus, in their own cars or even at the cafe. They sit with their face planted in a smartphone, tablet or laptop and share uninteresting tidbits and meaningles pictures and use silly, misplaced terms like "yolo" (eating burgers is living on the edge, so is buying new shoes), looking for attention, they live their lives through the internet and somehow find other people's lives interesting (even though their lives also mostly consist of spending time on social networks and services). Why go with a bunch of friends to a restaurant of coffeeshop only to sit there clicking and touching devices and oogling at pictures, reading about fashion and diets and other people visiting the coffeeshops and restaurants? 
The best part if where they think that gamers are "wasting their time" and being "antisocial".
Maybe there's something wrong with me... 
