First (at least for me) there was Facebook, followed by Twitter, Instagram and Snapchat. Social media is ever evolving, for better or worse. Facebook was founded in February of 2004 by Mark Zuckerberg. Twitter was founded by Jack Dorsey in March 21, 2006. Dorsey is an American web developer widely known as the co-founder and co-creator ( with Biz Stone) of Twitter. Twitter is now worth billions of dollars. As of three years ago, it was worth more than $5 billion and climbing towards $10 billion in secondary markets. Interested in an in-depth history of twitter?