Where can I find RP?

Hey guys! I was just curious where exactly I should look to find RP, once I'm in game?

First, which realm do you play?

I'm sorry, I really should have phrased that *much* better. I want to play on a WotLK Realm, but I was curious first off the best realm to pick for that.

I'm not sure about Icecrown, but we have one fairly established RP guild in Alliance side in Lordaeron realm. We just did our second storyline event today.

There are people that roleplays on Frostwolf also.