Why do senior managers keep thinking that we want social networks at the office? My previous company tried to foist Jive on us, and other than an initial token gesture by senior management, they didn't use it... and guess what? It's them who already needed to improve their communication with the rest of the company. I really don't give a shit about whatever banal thing somebody's doing today, right this moment. It's just noise. I will socialise in the pub after work, or even at lunch time, where I can speak my mind if I wish. Otherwise these overpriced toys don't help me get anything done.
Senior management love to have big sounding objectives like "I will continue to improve communications with my staff" on their performance reviews. It's an easy box to tick by posting a couple of blogs copied from press releases and a tweet about the Xmas party during the year.