I'm not being pedantic, I'm disagreeing with you. Friendster (2002) was wildly popular. LiveJournal (1999) was huge. The things you list (Usenet, BBSes, etc) we

I'm not being pedantic, I'm disagreeing with you. Friendster (2002) was wildly popular. LiveJournal (1999) was huge. The things you list (Usenet, BBSes, etc) we're the precursors but they were not social media where LiveJournal was (to an extent) and Friendster is arguably the original. There was something before Facebook and MySpace and there will be something after. Facebook is neither unique enough nor important enough to hold in this level of esteem. It is and always has been derivative.