Yeah the niches have been filled. Facebook is the personal profile networking thing, Instagram is the photo thing, X-Twitter is the “shout your inner monologue” thing, Reddit the anonymous networking thing, TikTok the short vid thing, Tinder the sex thing. Alternatives to the dominant platforms just won’t catch on because no new gadget is more valuable than a critical mass. We’re in the late stage of social media Phase I, and it’ll take something fundamentally (not cosmetically) different to shake us out of Phase I and kick off Phase II.