I'm with you and I
don't have any connection with, or financial interest in, Facebook. I use it. A lot of my friends and family do too.
It makes it easy to stay connected with and re-engage with people in your social group.
It managed the spam problem reasonably well (those Ray Ban scams are a relatively infrequent problem).
It makes to easy to start, run, find, and join niche interest groups. I'm in a dance community that would find it much harder to find each other's events without Facebook Events. My wife is in a vintage community that carries out low-friction international vintage clothing exchanges through Facebook Groups.
There are communities using Facebok to run small businesses and serve their communities.
Oh and I change my phone number when I change phone company because it's easier than not.
Now, I also think there are things wrong with Facebook and with how the network effect impacts on its competition. I think it could use oversight and regulation. But your naysayers are unimaginative children. Of course Facebook provides societal benefits. Get real.