Re: "Interaction" != work
Doubly so with in-house Faecebook type applications being introduced. In my experience, whilst these may reduce email traffic, this is far, far more than offset by the torrent of sycophantic twaddle and meaningless chatter ( looking at you, HR and "professional development" types).
So far our corporate structure has been invaded by fitst Tibbr and its social networking and now Yammer. I have yet to see a single messaage on either platform, that is of any actual use.