FetLife is a relatively respected kink social media platform. It's not about hooking up (though that certainly happens, just like on any online platform - hell, I knew people that later married that met in EQ). From my limited experience there, it's mostly about making everyone feel less ostracized. Of course, they have to have very explicit rules about consent, or that turns into a predator's playground - but again, that's true of any social media platform.