So far the only CYOA I’ve paid attention to (and lightly partcipated in) is Colt Quest. I came across it while looking up a tag and came across one of the pages, then checked out a few more pages before becoming hooked (thanks, Psker, for bringing that here on Derpibooru BTW). I’ll admit I’m not very accustomed to posting in /mlp/, I wish I could play from Derpibooru, but eh, as long as there’s one place to do it at all. Didn’t know there are a few on fimfiction.net though.
I might check out more CYOA’s in the future.