I'm kinda new to DWRP but I was big into LJ RP a few (long) years back. There were a couple of fun comms that were super active, I think one was called Sages (of Chaos?) where characters could ask questions and anyone could answer, one was called Theatrical Muse where a prompt would go up every week and characters would write drabbles and comment on each other's journals, and I think there was some kind of nexus Cafe where characters from different worlds would just come in and RP doing things at the cafe. I haven't seen anything like this yet here in the few months I've been back, but it would be really awesome if they did exist or someone was interested in restarting them.