Facebook is too close and personal for me. I’ll log in, read a post from a relative or someone I like and respect about how Trump is the greatest thing since sliced bread, and it ruins my zen. So now I’m hit and run with Facebook. Log in, make sure no one died, post a picture of my baloney sandwich, then bounce.
On Twitter, no obligation to follow any friends or relatives. The flow is more natural and much more controllable with regard to the context on why I’m on Twitter at that moment.