LinkedIn posted fourth quarter earnings of 39 cents per share on revenue of $447 million. Analysts were looking for 38 cents on sales of $438 million. Last year LinkedIn earned 35 cents on sales of $304 million in its fourth quarter. For the current quarter, the online networking company sees revenue in a range of $455 million to $460 million, below the consensus estimate of $470 million. The shortfall is driving the stock down over 10% in after hours trading after it rose 4% in the regular session.