Air date: April 24, 2009. David Letterman doesn’t understand Twitter. Update: David Letterman has been using Twitter since 2007: twitter.com

Derek

Online diaries are like regular diaries only you don’t need to be embarrassed that you own one. See more at collegehumor.com

Rolando

Twitter is the latest social-networking craze and it is based on a very simple question: What are you doing? www.kmbc.com

Shawn

A quick and plain English intro the micro-blogging service Twitter. Follow us: www.twitter.com This video comes in an unbranded “presentation quality” version that can be licensed for use in the workplace. www.commoncraft.com

Yolanda