who is facebook's founder?
Mark Zuckerberg
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 The oldest Twitter accounts are 14 accounts which became active on March 21 , 2006 , all belonging to Twitter employees at the time and including @ jack ( Jack Dorsey ) , @ biz ( Biz Stone ) , and @ noah ( Noah Glass ) . 

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 Twitter was created in March 2006 by Jack Dorsey , Evan Williams , Biz Stone , and Noah Glass and launched in July 2006 . The service rapidly gained worldwide popularity , with more than 100 million users posting 340 million tweets a day in 2012 . The service also handled 1 @.@ 6 billion search queries per day . In 2013 , it was one of the ten most @-@ visited websites and has been described as " the SMS of the Internet " . As of March 2016 , Twitter has more than 310 million monthly active users . 

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 In September 2011 , board members and investors Fred Wilson and Bijan Sabet resigned from Twitter 's Board of Directors . In October 2012 , Twitter announced it had hired former Google executive Matt Derella to become their new director of business agency development . Twitter named former Goldman Sachs executive Anthony Noto as the company 's CFO in July 2014 , with an " annual salary of $ 250 @,@ 000 and one @-@ time restricted stock options of 1 @.@ 5 million shares ... valued at $ 61 @.@ 5 million " . On June 10 , 2015 , Twitter announced its CEO Dick Costolo would resign on July 1 , 2015 . Noto was said to be considered a potential replacement for outgoing CEO Costolo . On October 14 , 2015 , former Google chief business officer Omid Kordestani became executive chairman , replacing Dorsey who remains CEO . On January 26 , 2016 , Leslie Berland , former executive vice president of global advertising , marketing , and digital partnerships at American Express , was named chief marketing officer . 

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 By March 2009 communications consultant Bill Douglass predicted in an interview that Twitter would be worth $ 1 billion within six months , which came to pass when the company closed a financing round valuing it at $ 1 billion in September of that year . 

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 In October 2010 , Hurley announced that he would be stepping down as chief executive officer of YouTube to take an advisory role , and that Salar Kamangar would take over as head of the company . 
