Too bad we didn't find this until after the new year.  Here's a fabulously inspired look at how 'engagement' and 'interactivity' in e-Learning does not equate to learning in any way...http://www.learnnuggets.com/nuggethead/NH_christmasCard.html

If you are thinking about how to use Twitter in an educational way, check out this list of articles which address the idea in various ways: http://www.c4lpt.co.uk/socialmedia/twitterrl.html