Facebook is fun...but I remember Gregor Kennedy (from the University of Melbourne) speaking at a
CRIG Forum a few years back about his research on information literacy and the Google age; at that stage, he found that most Web 2.0 innovations were still more popular as
social networking tools, rather than
study tools. But this
Mashable.com article recently listed some great ways for educators to utilise Facebook in an educational setting (basically set up a private group and post related educational links to your followers - most importantly, you can do this without having to be 'friends' with your group members)...