TikTok, IG Reels, and YouTube don't depend on a social graph at all
> There is a distinct experience and ecosystem that arises from those types of sites that we all recognize, which didn't exist in the same way before the advent of social media sites. And it warrants discussion.
No that's the intellectual trap that allows you to use different standards to judge the two types of social networks. HN, Reddit, and Facebook all suffer from the same types of social problems. Bots, astroturfers, growth hackers, zealots who spread exaggerated or fake information to further their cause, conspiracy ideation reinforced by the network, etc. To classify these networks separately is to be blind to how similar they all are.