Twitter, Inc. is a global platform for public self-expression and conversation in real time. It provides a network that connects users to people, information, ideas, opinions, and news. The company's services include live commentary, live connections and live conversations. Its application provides social networking services and micro-blogging services through mobile devices and the Internet. The company can also be used as a marketing tool for businesses. Twitter was founded by Jack Dorsey, Christopher Isaac Stone, Noah E. Glass, Jeremy LaTrasse, and Evan Williams on March 21, 2006 and is headquartered in San Francisco, CA.