Until recently, Nick Welihozkiy lived a double life: Sales manager at LinkedIn by day, athlete training for the hammer throw in the Summer Olympics by night, with the support of the company's management. That has come to an end: His boss abruptly fired him amidst the recent upheaval at the IPO-bound startup. Welihozkiy was seen by many as the heart of LinkedIn's culture, and have taken his departure hard. Even so, LinkedIn's marketers continue to exploit Welihozkiy's image: He appears prominently on the company store's homepage, dressed as Clark Kent turning into Superman, with a link to his LinkedIn profile. He hasn't updated it.