We do, actually, and it's http://neonoah.enjin.com/. While it's under our FC's name, we actually also use it to keep track of weekly events held by other FCs and LSes. It may look inactive at the moment, but that's just due to me having some family issues the past couple months and not thinking to update it. Everything should be cleared up in a couple weeks though, and it'll be back to normal!

There's definitely an RP community on Siren, it just needs people to come out of the closet. The LSes tend to be a bit more casual in their RP, while my FC is on the heavier side, though we're not all-out RP-only. I welcome moar RP friends.