A photo from the CEO of Goldman Sachs is fueling Twitter takeover chatter (TWTR)

Lloyd Blankfein / Twitter Twitter's stock surged as much as 7.3% on Thursday after Goldman Sachs CEO Lloyd Blankfein tweeted a picture of himself at the company's headquarters. Goldman had reportedly advised Twitter in takeover discussions with Disney last year, and the tweet fueled speculation that a deal could be in the works. Meanwhile, short sellers are scaling back bearish bets on Twitter. Traders are piling back onto the Twitter bandwagon. The company's stock surged as much as 7.3% on Thur...