Just read a report from Nielsen (found here) that notes that although Twitter has received an immense amount of media notice and exponential growth, this growth is mostly fueled by the 25-54 age group. Only 16% of teens use Twitter.
That seems like a sobering statistic for those of us wanting to start up Twitter services in the library. If only 16% of our biggest user group, students, are using the service, is this the group we should cater to. It seems like the best use of Twitter would be to figure out what our faculty would like to see and provide that, as that age group shows the greatest growth in twitter users at 64%.
Here's the chart: