I still log into Facebook monthly to see updates from my parents/relatives, who still use it somewhat regularly. I can't remember the last time I saw a post from anyone I know personally under the age of 60, aside from the one guy who posts political rants every day.

I hear a lot of people talk about Facebook Marketplace, but that's not a thing where I live, that probably pushes up the numbers a lot. When I do log in I sometimes check on some of the retro tech/homelabbing communities and they seem pretty popular with many posts a day, so there are definitely people there.