Discord is interesting; it’s not REALLY a social network – yet they just came out with profiles not that long ago so they’re clearly thinking about it.
It’s not easy to find people or groups because there’s no “generic public areas”; so it has a “sense” of privacy. Of course once you’re IN with a group, that all changes.
I think you’re right about it being Tiktok – it has the profile pages and you can look anybody up. But being restricted to video it can be limiting as well; video memes can be shared and recopied but static ones have to be turned into video; and text like this isn’t really possible.
But the comment sections function well enough, so like Youtube, that’s where the socializing seems to take place.