To be honest, Reddit shouldn't be too much of a problem. I've been using /r/ffxiv for months, and most of the community there is friendly and helpful, and when I first jumped on, I put up a topic asking about RP, and was greeted with quite a few replies from people telling me where to go, linking me to this site and a lot of people who will also be RPing.
It'll be 4chan thats a problem, if anything.