SAN FRANCISCO - Twitter has several people who have played key roles in the building of the popular one-to-many messaging service:
Jack Dorsey (@jack), 36, the best-known of the Twitter founders, was also the author of the first tweet on March 21, 2006. Dorsey claims the idea behind Twitter and developed the computer code with German programmer Florian Weber (@florian).
Dorsey was chief executive from 2007 to 2008, and now is executive chairman. He is also head of the payments firm Square, started in 2010.
Dorsey holds 4.9 per cent of Twitter shares and has a fortune estimated by Forbes Magazine of $1.3 billion.
Evan Williams (@ev), 41, is the largest stockholder with 12 per cent of Twitter capital. Williams worked in Silicon Valley start-ups Pyra Labs and Odeo before joining Twitter. He succeeded Dorsey as CEO before leaving that post himself in 2010.
Born and raised on a farm, his profile says he "likes long walks in the city, tofu, and burgundy." He is working on another start-up, a publishing platform, called Medium.
Christopher "Biz" Stone (@biz), 39, is credited with the design of Twitter.
Stone wrote in Wired magazine that he managed to be hired by Google in 2003 by creating a company called Genius Labs, which was "just me," before moving to a series of start-ups. He is working on his own mobile app called Jelly, with capital from Dorsey and Williams, as well as former vice president Al Gore and pop star Bono.
Stone is a vegan and is devoted to several organisations working for the environment, health and education.
Noah Glass (@noah) states on his Twitter profile, "I started this," but he was not among the founders participating in the investor presentation for the initial public offering.
Glass, who according to some reports was forced out of Twitter and will not cash in from the IPO, claims he came up with the name Twitter by paging through the dictionary.
In a September tweet, he said, "I wish the twitter team the best of luck and trust that they will be successful in continuing to develop this important communication tool."
Dick Costolo (@dickc), 50, has been CEO and chief Twitter spokesman since October 2010. A University of Michigan graduate, he briefly worked in improvisational comedy and theatre before joining Andersen Consulting.
In 2004 he founded the RSS tool FeedBurner, which was bought by Google in 2007. He worked at Google until 2009 before joining Twitter.