So... an IRC channel? Feels like joining a Star Wars room wouldn't differ from `irc.Twitter #StarWars` other than platform. The creator of an IRC channel is the Op and can promote others to be Hops (moderators). IRC channels are generally based on what can be seen as the equivalent of a hashtag...

You'd have to find a way to sell this as something different than IRC, because I doubt the idea of "IRC on Twitter" has never crossed Twitter's mind. What differentiates it other than being hosted on Twitter?

IRC on Twitter would be popular if only because Twitter is about a frillion times more popular than IRC.

Exactly.

Rooms is an interesting direction. Twitter is part RSS reader, part chat room. It would be nice to follow hashtags on a topic, but then spammers would flood the hashtags with ads.

That's definitely something to figure out. I have a few thoughts about it, I just didn't wanted to keep the post short(er). But yeah that's a great point.

I just wanted to keep the post short(er)

Isn't this what lists are, albeit perhaps more prominent?