Very little, to keep in contact with some of the grandkids. The name I use is not my given name and different from my handle here.
While the wife gets on FB to check on the grandkids, I mostly stay off it even though I'm a member.
I have a bro-in-law, a friend, and a few other people who are rabid liberals and do nothing but post anti-Trump/anti-Republican stuff all the time.
I don't need that grief. Arguing with friends/family members only raises the blood pressure.
I do get on a CBS news website in a major liberal city in my state that allows comments. Many large city websites do not allow comments below articles/stories.
I like to get on and irritate liberals. It's fun winding them up.