digg_url = 'http://digg.com/software/Is_Twitter_Really_That_Big';digg_bgcolor = '#ffffff';digg_skin = 'normal';It seems as though far less people are actually using and contributing to the site than Twitter's recent hype and massive growth would suggest. In fact, the data shows that a large percentage of Twitter users have not "tweeted" since the first day they joined the service and at least a quarter of its users don't have any followers at all.