Posting what we write on websites dedicated to writing seems obvious, but do you post your fic on websites that are not dedicated to writing, like social medias? Or do you keep the full fic on its fic site but still post about it elsewhere?

I personally have trouble posting about my writing, it always feels like it's not the right place for that. Like all the people interested in reading fanfic are already checking fanfic sites and it would just be annoying to most users of other sites to see posts about it. And while I'm sure part of it is just personal history with social medias, I'm unsure how much of it has basis in reality, because it's true that I almost never see fanfic-related posts where I lurk.

What's your opinion on that?