Facebook CEO Mark Zuckerberg may have traded in his Adidas flip-flops for tennis shoes, but he was as coy as ever when it came to talking about the social network.  On stage at the Web 2.0 Summit in San Francisco, host John Batelle asked Zuckerberg about Dubai, referring to rumors that Facebook CFO Gideon Yu was in the Middle East seeking financing from the sheikhs.

“I’ve never been to Dubai,” Zuckerberg said. “I’m told it’s nice at this time of the year.”

Never one to give up easily, Batelle dug deeper: “Gideon must have told you that.”

Zuckerberg’s silence was long enough to make a point before he said, “Oh.”

Never mind, Batelle just continued lobbing the questions at Zuckerberg, who was dressed down as usual in a black Northface fleece.