The defection from Twitter to Yammer has been interesting; a few weeks ago we were twittering away then along came Yammer. It not only attracted a greater number of UL employees but those with dual status seem to have gradually moved across and deserted Twitter in favour of Yammer. There’s a noticeable decline in Facebook contributions too. It seems that one is enough. Two is too many. Is this the nature of Web 2.0 tools? The flavour of the month is easily replaced by a new taste. What will take over from Yammer? There must be something equally new and addictive just waiting in the wings.