My primary reason for starting and maintaining a Facebook account was to keep in touch with remote relatives. The secondary reason was to promote my businesses.
In reality I barely posted anything, liked things sporadically and rarely commented. It was nice to see what people were up to but most of my feed was people liking pithy sayings, liking pictures of memes and a good helping of ads and questionable news articles.
Having 7 kids I don't get much free time so I pick activities that give me value.