A lot of young people are back on Facebook for Marketplace. It's the "app" a lot of people use nowadays to find cool second hand furniture.
That's literally the extent though. And a little bit for groups. But other than that, I don't know the last time myself or any of my friends have posted a status update. Maybe the occasional wedding announcement or baby photos, but it has to be that big of an event. And then the women get more active when they become moms, cause seemingly the family who skews older wants to see the babies.
Cool kids used Instagram till 2015. Now their parents use it, while they use TikTok
The parents are the ones with money to spend, which means they're the ones advertisers want.