You mentioned that you're not in games right now. I find that plurk really changes when you're not actively playing in a game with others; they're busy keeping up with tags and often bringing up old games and CR brings out the nostalgia goggles at best.

I also found that it took a long time to work back up to in-game levels of chatting once I joined a new game. Plurk's a difficult networking source just for hanging out with friends, unfortunately.