I hang out on a private IRC server with about 15 folks, mostly old friends of mine working in various parts of the industry. It's primarily a place to talk about geeky topics and complain about work.
We've even built a bot to capture URLs and tweet them to a private handle so people can check out sites after work or while away from the channel.
To the person asking if IRC is distracting, it's a LOT less distracting than the hipster that sits next to me and is constantly checking his smartphone every time an SMS comes in. Pavlov would roll over in his grave.