Twitter Celebrates 4th Birthday by Scott Beale at 7:05 am on March 21, 2010 Twitter is celebrating their 4th birthday today. Twitter co-founder Jack Dorsey sent out the first Tweet on March 21st, 2006. This is back when it was called Twttr. Here’s a CBS 5 News video from 2007 featuring Robert Scoble talking about Twitter a couple of weeks after Twitter won a Web Award at SXSW 2007. UPDATE: Fail Whale creator Yiying Lu made this beautiful illustration in honor of Twitter’s 4th birthday. via Jack Doresy, Gabe Rivera & The Next Web More Related Laughing Squid Posts Subscribe to Laughing Squid by email and receive a daily email with all our blog posts from each day.