Sandy
Five years ago on March 21, Twitter co-founder Jack Dorsey fired off the first tweet officially giving life to the micro-messaging service.
Here are some facts about the San Francisco-based startup:
* Dorsey's first tweet, sent on March 21, 2006, read: "just setting up my twttr" .
* Pop star Lady Gaga (@ladygaga) has the most Twitter followers with 8.78 million followed by Justin Bieber (@justinbieber) with 8.13 million, Britney Spears (@britneyspears) with 7.12 million, Barack Obama (@barackobama) with 6.97 million and Kim Kardashian (@kimkardashian) with 6.73 million.
* Actor Charlie Sheen (@charliesheen) was the fastest to one million followers, picking them up in just 24 hours.
* The hashtag (#) feature on Twitter which groups tweets by subject debuted in August 2007, proposed by a user
* In October 2009, Google and Microsoft began integrating tweets into their search products.
* Twitter has "370-plus" employees and is adding workers almost weekly
* Twitter is based in San Francisco, with additional employees in New York, Chicago, Los Angeles and Washington.
* Twitter was incorporated in April 2007; it was co-founded by Biz Stone, Evan Williams and Jack Dorsey -- @biz, @ev and @jack.
* The initial Twitter logo was created byTwitter co-founder Biz Stone, a former graphic designer.
* Twitter chief executive Dick Costolo is a former improvisational comedian.
* Twitter has more than 200 million registered users sending more than 140 million tweets a day.
* Last year, Twitter users sent 25 billion tweets and the company added more than 100 million new registered accounts.
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