The university I work at, without any kind of official direction, has had the entire staff body move from the internal mailing list to Yammer for staff chat. It is brilliant.

I'll look at it a bit closer then.

Was just being annoyed by the 60 day thing really, purely as I am not sure I would want to hire someone who jumped someone else's ship just because I set a deadline.

I shouldn't really extend my annoyance to being snarky about their products as I admittedly know little about them.

They are pretty cool for mid-size groups. They won TechCrunch 50 (or were a finalist) the year I went.