Why did LinkedIn stock tumble? Was LinkedIn stock's 20% sell-off merited in the first place? To explore whether or not it was, here's the backstory on the reason for the sell-off. LinkedIn's first quarter results were actually solid. The company's revenue and non-GAAP EPS exceeded its guidance for $618 million-$622 million and $0.53, respectively. Actual results were revenue of $638 million and non-GAAP EPS of $0.57. Indeed, LinkedIn even exceeded analyst estimates for revenue and EPS of $637 million and $0.56, respectively. So, what spooked the market?