The document provides information on the founders and origins of major social media and technology companies. It lists Facebook as being founded in 2004 by Mark Zuckerberg and others as a social networking platform. Twitter is described as a microblogging service launched in 2006 by Evan Williams, Noah Glass, Jack Dorsey and Biz Stone. LinkedIn is summarized as a professional networking platform founded in 2003 by Reid Hoffman and others.