I was in high school when Facebook took off in my country (2008). And fair enough, first few years were maybe more “social-ish”. I left the platform by 2012 though.
Might also say more about me and my social behaviour than the social media platforms themselves, I never cared about it too much.
personal blogs, tumblr, forums, BBS, some kind of irc and platforms like Discords remained active throughout the 2010s to actually be social
a bunch of ppl turned to Facebook as it was just what the mob did, but it still required to be active in groups indeed