That's a good point. Most "social media" platforms these days are more about ad distribution than anything else.I don't use social media in general. Never seen the point. If I were running a business, it would be different because it's an advertising platform.
I used to have a mostly blank placeholder Facebook account way back when, solely because it was necessary to be able to read some stuff online, but it got terminated when they decided you had to use your real name on it... they wouldn't let me start a new account with the same email address and I wasn't about to bother getting a new email address just to set up an account I was never going to use anyway.
Excluding forums, I'm registered on 7 of them that I use at least from time to time. However, if we talk about active use, then it's really only Discord, Twitter, Instagram and Youtube. And I don't really treat the latter two as part of the social space and more as content delivery networks.