Have been using Yammer for some months now and find it to be a valuable source of information. Have had some very useful ideas and links that I have passed onto TAFE staff.
I must admit there are days when I don't link in because I am too busy, involved in other activities and just don't think about it. Also, because it doesn't play a major role in my work practices I have to remember to do it, in amongst my other tasks. Maybe it's just a matter of my headset, and that this will gradually change in time.
Certainly a great source of unusual information at times, and some instant online help/advice when needed. It is a useful communication tool for staff, much quicker than emails. A quick way to get library information/messages out into the wider TAFE community, or to respond with a library perspective to messages put up.