By Alisha Azevedo in the Wired Campus section of The Chronicle of Higher Education November 16 2012. This article describes a class (on cellphone culture) where the discussion was conducted entirely over Twitter.
Mashable.com is a very popular site for learning more about important social media tools, with information on trends, lists (e.g. 11 Essential Social Media Resources You Might Have Missed), and how-tos, included guides to Twitter and Facebook.