When was Twitter launched?
March, 21: The social media site Twitter is founded
Twitter is now worth more than $5 billion — and climbing toward $10 billion on secondary markets. Twitter was created in March 2006 by Jack Dorsey, Evan Williams, Biz Stone and Noah Glass and launched by July 2006. The service rapidly gained worldwide popularity, with more than 100 million users who in 2012 posted 340 million tweets per day.