LinkedIn (LNKD.DL) is a hot stock. Shares are up more than 50% year to date. Now investors are wondering whether or not the company can continue to meet increasingly higher expectations. And, if the company fails to deliver, what will happen to the stock price?

Unfortunately, no one has a crystal ball. Guessing a stock's next move is a gambler's game. But, as Fool contributor Daniel Sparks points out in the video below, investors can at least keep a close eye on the business; three metrics that management is already watching provide investors useful context for following LinkedIn's growth story.