Well that's three, there are at least 1200 more and that's not including the YouTube and Instagram like sites that are, or could be, federated, and they all have slightly different feature sets depending on what software they're running.
That's what I'm talking about. A way to describe those feature sets in a word.
But the term you might be looking for is federated. Each platform has its own lexicon for what it stands for and how to interact. Is pictures, videos, content aggregation, microblogging, blogging, etc. there are more than 1200 and each has its own internal language and how users refer to it. No different than facebook, Twitter, instagram, blogger, blogspot, MySpace, …, etc. But, they all run on activitypub, which is an agreed upon format for things. The various forms are new and developing, so every form of social interaction is different in how they refer to themselves.
So you're looking for a word that's a descriptor for different types of social media e.g. aggregator vs video/image/audio hosting vs microblogging. The first word that comes to mind is that they might be different paradigms of social media?