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Twitter CEO Dick Costolo looks up while waiting to see what Twitter's opening market price will be on the floor of the New York Stock Exchange (NYSE) on November 7, 2013 in New York City. Twitter went public November 7, on the NYSE selling at a market price of $45.10, with the initial price being set at $26 on November 6. (Photo by Andrew Burton/Getty Images) ( Staff )

Twitter CEO Dick Costolo, center, and Mike Gupta, chief financial officer of Twitter, wait for shares to begin trading during the IPO, on the floor of the New York Stock Exchange, Thursday, Nov. 7, 2013. If Twitter's bankers and executives were hoping for a surge on the day of the stock's public debut, they got it. The stock opened at $45.10 a share on its first day of trading, 73 percent above its initial offering price. (AP Photo/Richard Drew) ( STF )

Twitter Chairman and co-founder Jack Dorsey, and co-founders Evan Williams and Biz Stone, wait for the opening bell to be rung at the New York Stock Exchange, Thursday, Nov. 7, 2013. If Twitter's bankers and executives were hoping for a surge on the day of the stock's public debut, they got it. The stock opened at $45.10 a share on its first day of trading, 73 percent above its initial offering price. (AP Photo/Richard Drew) ( STF )

Twitter CEO Dick Costolo, does a high-five with NYSE CEO Duncan Niederauer, right, as shares begin trading in the company's IPO, on the floor of the New York Stock Exchange, Thursday, Nov. 7, 2013. If Twitter's bankers and executives were hoping for a surge on the day of the stock's public debut, they got it. The stock opened at $45.10 a share on its first day of trading, 73 percent above its initial offering price. (AP Photo/Richard Drew) ( STF )

Traders wait for the opening trade of shares of Twitter at the New York Stock Exchange in New York, New York, USA 07 November 2013. Shares in Twitter were trading at over 50 dollars - an increase of more than 90 per cent from its offer price - minutes after the start of public trading on 07 November. The shares opened at 45.10 dollars. The soaring debut on the New York Stock Exchange came just hours after Twitter said it was pricing its initial public offering (IPO) at 26 dollars a share, the third time it raised the price since filing to go public. EPA/ANDREW GOMBERT ( STF )

Twitter CEO Richard Costolo, Chariman and co-founder Jack Dorsey (3-L), CFO Mike Gupta (4-L) and co-founders Evan Willaims (2-R) and Christopher Isaac 'Biz' Stone (R) as trading starts at the New York Stock Exchange in New York, New York, USA 07 November 2013. shares in Twitter were trading at over 50 dollars - an increase of more than 90 per cent from its offer price - minutes after the start of public trading on 07 November. The shares opened at 45.10 dollars. The soaring debut on the New York Stock Exchange came just hours after Twitter said it was pricing its initial public offering (IPO) at 26 dollars a share, the third time it raised the price since filing to go public. EPA/ANDREW GOMBERT ( STF )

A handout image made available by the New York Stock Exchange (NYSE) in New York City on 07 November 2013 showing British actor Sir Patrick Stewart (R), flanked by Vivienne Harr (2-L), Boston police officer Cheryl Fiandaca (L) and Twitter co-founder Evan Williams (2-R) at the ringing of the opening bell to mark Twitter's highly anticipated initial public offering (IPO), New York during the ringing of the opening bell to mark Twitter's highly anticipated initial public offering (IPO), New York, USA. Twitter was to offer shares to the public at an initial price of 26 dollars a share, the short-message internet giant had confirmed 06 November. 'We've priced our initial public offering of 70,000,000 shares ... to the public at 26 dollars a share,' the company said, adding that it could offer an additional 10.5 million shares if demand was strong. The IPO values Twitter at about 14 billion US dollars, far below that of Facebook, which was valued as high as 80 billion dollars at the time of its IPO. Twitter, however, has fewer users and its format makes it harder to advertise on, limiting its chances to immediately generate substantial revenue. Vivienne Harr operates a lemonade stand, and uses the money she earns to fight slavery. EPA/NYSE / HANDOUT ( HO )

Richard "Dick" Costolo, Chief Executive Officer of Twitter Inc (L) along with Jack Dorsey, Chairman and co-founder (3L), Mike Gupta, Chief Financial Officer (4L) and Christopher Isaac "Biz" Stone, co-founder of Twitter (R) applaud as trading starts at the New York Stock Exchange in New York, New York, USA, 07 November 2013. Shares in the company Twitter (TWTR) began trading on the NYSE at a price of 26 US Dollars (19.23 Euro). The man (2-R) is unidentified. EPA/ANDREW GOMBERT ( STF )

In this photo illustration, an online communication from Twitter is displayed on a computer screen announcing the company's initial public offering and debut on the New York Stock Exchange on November 7, 2013 in London, England. Twitter went public on the NYSE opening at USD 26 per share, valuing the company's worth at an estimated USD 18 billion. (Photo by Bethany Clarke/Getty Images) ( Stringer )

In this photo provided by the New York Stock Exchange, the New York Stock Exchange trading floor is crowded with traders and journalists on the morning of Twitter’s public stock debut, Thursday, Nov. 7, 2013 in New York. Twitter set a price of $26 per share for its initial public offering on Wednesday evening and will begin trading Thursday under the ticker symbol "TWTR" in the most highly anticipated IPO since Facebook's 2012 debut. (AP Photo/New York Stock Exchange) ( HOEP )

Richard 'Dick' Costolo, chief executive officer of Twitter Inc on the trading floor at the New York Stock Exchange in New York, New York, USA 07 November 2013. Shares in the company Twitter (TWTR) began trading on the NYSE at a price of 26 US Dollars (19.23 Euro), at the start of Twitter's highly anticipated initial public offering (IPO). EPA/ANDREW GOMBERT ( STF )

Traders are shown with the logo of Twitter and the symbol on which Twitter's stock will be traded (TWTR) on the floor of the New York Stock Exchange (NYSE) on November 7, 2013 in New York. Twitter goes public on the NYSE today,and is expected to open at $26 per share, making the company worth an estimated 18 billion USD. EMMANUEL DUNAND/AFP/Getty Images ( Staff )

A banner adorns the facade of the New York Stock Exchange in advance of Twitter's initial public offering Thursday, Nov. 7, 2013, in New York. Twitter shares, valued at $26 per share, are set to begin trading on the stock exchange Thursday. The company is valued at $18.1 billion. (AP Photo/Kathy Willens) ( STF )

Specialist Glenn Carell, who will handle the Twitter IPO, works at his post on the floor of the New York Stock Exchange, Thursday, Nov. 7, 2013. Twitter set a price of $26 per share for its initial public offering on Wednesday evening and will begin trading Thursday under the ticker symbol "TWTR" in the most highly anticipated IPO since Facebook's 2012 debut. (AP Photo/Richard Drew) ( STF )

Traders prepare for the opening bell at the New York Stock Exchange in New York, New York, USA 07 November 2013. Shares in the company Twitter (TWTR) begin trading on the NYSE at a price of 26 US Dollars (19.23 Euro). EPA/ANDREW GOMBERT ( STF )

A worker unveils floor mats bearing the logo of Twitter and the symbol on which Twitter's stock will traded (TWTR) on the floor of the New York Stock Exchange (NYSE) on November 7, 2013 in New York. Twitter goes public on the NYSE today,and is expected to open at $26 per share, making the company worth an estimated 18 billion USD . EMMANUEL DUNAND/AFP/Getty Images ( Staff )