When I'm on Facebook and a chat pops up, I typically curse and close the browser immediately or quickly attempt to find the "invisible" setting. It's not that I don't like my friends, if I am on the computer I am probably working. If I want to socialize I may send out a Tweet or a text message, which they can respond to at their leisure.
I asked the staff and they agreed. I could find no staffer that admitted to chatting on a social network willingly, though one did say he occasionally feels he must.
Do you use the chat feature on social networks?