I’d say the defining characteristics is being people vs content based.
Something like FB/Insta/Xitter/Mastodon is person centric, you’re looking at and interacting with things based on who posted it, even if it’s an algorithmic bot pushing it on you.
Something like Lemmy/Piefed/Reddit you engage with the content and other people based on the content and/or the topic of the board. There are notable people who post and comment a lot, but they’re not the draw any more than the comment section of a news site.
I’d say the defining characteristics is being people vs content based.
Something like FB/Insta/Xitter/Mastodon is person centric, you’re looking at and interacting with things based on who posted it, even if it’s an algorithmic bot pushing it on you.
Something like Lemmy/Piefed/Reddit you engage with the content and other people based on the content and/or the topic of the board. There are notable people who post and comment a lot, but they’re not the draw any more than the comment section of a news site.