Goldman Sachs has kicked off an internal probe into who’s running Twitter feed @gselevator, which claims to dish the dirt on things said in the company elevators. A source told us that following “a failed attempt to force Twitter to freeze the account, they are investigating who is behind it. They believe it is an intern or a young gun, but there are enough facts on the feed for bosses to suspect it is someone with access inside the company. The culprit may just be riding elevators, but that is caught on camera.” There is no absolute proof that the tweeter, who claims to be a Goldman banker but uses an anonymous Gmail account, really works for the firm. His tweets of overheard conversations include: “Suit#1: ‘Was that really an earthquake?’ Suit#2: ‘No, I just dropped my wallet.’ (laughter).” And, “My garbage disposal eats better than 98% of the world.” Also, “Suit #1: ‘I let him present one slide. He was sweating and stuttering like Michael Jackson in Mothercare.’ ” Goldman denied there is an investigation.