Gaia Online is an anime role-playing website with customizable avatars and a massive member list. It has a wide variety of forums to chat in, although most of those forums are occupied by chatspeak-slinging, tactless morons who will flame you for any variety of offenses, including but not limited to:
Posting a topic in the wrong forum.
Using slightly worse grammar than they do.
Defending someone who is being mercilessly flamed.
Despite all this, the website is unparalleled in its addictive qualities, and with some time and effort, some fun and intelligent chat can be found there.