I'm not really out in the writer's community. At least, nothing that's considered main stream for fiction writers.
I frequent an art site at http://deviantart.com where I have a gallery and ask opinions and share ideas with other artists/writers.
There's a Sailormoon community that I visit at http://toweroftime.com. I often share my original ideas there and ask for help on things. For a community dedicated to a Japanese cartoon, the ladies (and some boys) I talk to through there are quite helpful and have helped me out a great deal. I've met authors there who are struggling to get their stories written. Original works of fiction. We're all very supportive of each other. Some have helped me and I've helped others. It's a great deal of fun.
I also frequent a site http://tomgeeks.com. I get some feedback through there as well, though mostly on my comics.