Twitter is the online social networking site that asks, "What are you doing?" You "tweet" up to a 150-character reply. Here is my vote for the funniest posted tweet to date.(For non twitter folks: writing @ before another twitter account holder's ID will ensure your "tweet" will be delivered directly to that person's account, so they'll be sure and see it, even if they don't catch it when it scrolls by at the original time of posting.)
Tweet by Anil Dash: "@barackobama I will paypal you $20 if you intersperse the phrase "Allah willing" throughout your inaugural address, just to piss people off."
Picture it: Obama onstage saying, "Yes we can! Allah willing..."
Almost peed myself laughing...
(Props to Melody Watson who alerted me to this tweet.)