Hubby is addicted to IRC. Has been for years. That's actually why we have to have 2 computers. I found that when I brought work home to do on the computer it was a fight to the finish to get him off.
I've gotten over my IRC hatred now, but it cause a lot of problems in our relationship at the time.
Anyway, to answer your question, I don't have it on my computer, and since I am on here at work most of the time we are strictly forbidden to have any chat software installed.