On both social media I still use, I followed bunch of indie ttrpg devs. I had to unfollow the ones on tumblr because they don't talk about anything but how much they hate D&D, up to including writing weird headcanons about people who help popularize it (I actually seen someone on tumblr claim Brenann Lee Mulligan must HATE D&D because only dumb people could like it and is only pretending to like it for clout) or bich about how D&D fans only want to play D&D and get mad when you tell them they're complaining about a small minority.
meanwhile indie ttrpg devs on Bluesky constantly promote their work and inform of sales of their products. I found many cool games through bluesky, meanwhile nove through tumblr.
I'm pretty sure Critical Role has also done some Monsterhearts stuff, which is also indie. I don't personally like that game for a myriad of reasons, but I do believe Mercer ran it one or two times.