Great graphic and thank you for sharing.
Now let's filter out bots, low quality trolls, NPCs, and content that isn't easily searchable. It's definitely an interesting diagram, and, though it is fascinating, I think its a 1 dimensional view of the social space.
I prefer to engage around ideas and topics, rather than specific users or content producers, so having a good search and topic based boards or groups immediately puts a site miles ahead for me. Reddit and Lemmy excel at this, but some of the others leave a lot to be desired. As someone who used FB to organize and manage a topic based social group in real life, with a Facebook group of 1000+ participants, FB has some good groups, but the interface is absolute rubbish and I would migrate to just about anything else if I could get people to move.
I guess my point is that we lump these together as "social media", but that's a broad category that holds some very distinct subcategories that excel at very different things.