I’ve tended to think of social networks as being built by people assembling a graph of people bottoms up, but perhaps I’ve been too narrow-minded. TikTok might not qualify by that definition, but it feels social, with FYP as village matchmaker.
Facebook, Instagram, and Twitter all build their feeds from content shared by friends and followers. The pool of content their algorithms choose from is limited or scoped. TikTok’s feed however is built from content shared by any user, regardless if you know them or not.