I've tried chat rooms once or twice, but I find that they go too quickly for me. Someone will say something interesting, and I start to type a reply. As soon as I'm about to send my 1-2 line reply, I see that the conversation has turned to something else.
My limited experience with chat rooms is that they are too much like a group of people sitting at a table, having multiple conversations, all at the same volume. For me, that's one of the most difficult things about group conversations.
Here's my example chat room conversation:
A: so I gave him the ol' heave ho!
D: Mmm. yum!
B: Just make sure there's no yolk in the whites at all or you'll never get them fluffy enough.
C: Do I need to use a special angel food cake pan?
D: OMG, you didn't!
A: Yeah. Do you think I should tell my sister about what he did?
D: Yes! It's really important that you do that!
It gets confusing, because the stuff is scrolling quickly, and you need to figure out who "D" was answering when she said, "Yes! It's really important...."
It takes me a long time to type. My fingers are quick, but I spend a lot of time thinking of what to say. So, chat rooms don't work for me. I just end up feeling lost and frustrated. I remember being in a chat room with a group of women I "knew" from a parenting forum. They knew I was there, and a few said "hi" and asked if I was going to join, but I couldn't get a word in edgewise.