Professors and Social Media -- Jerz's Literacy Weblog (est. 1999)

The data suggest that 80 percent of
professors, with little variance by age, have at least one
account with either Facebook, Twitter, YouTube, Skype, LinkedIn,
MySpace, Flickr, Slideshare, or Google Wave. Nearly 60 percent kept
accounts with more than one, and a quarter used at least four.
A majority, 52 percent, said they used at least one of them as a
teaching tool. —Inside HIgher Ed