Although we don't believe in timing the market or panicking over market movements, we do like to keep an eye on big changes -- just in case they're material to our investing thesis.

What: Shares of Dice Holdings (NYSE: DHX) tanked today by as much as 18% after the company reported fourth-quarter earnings this morning.

So what: Fourth-quarter sales added up to $47.4 million, narrowly topping the $47.3 million estimate. Earnings per share came in right on target at $0.15. Full-year revenue rose 39% to $179.1 million.

Now what: Guidance left a little to be desired, with first-quarter revenue forecasted at $46 million, which is below expectations. Full-year revenue is also forecasted to come in lower than investors were hoping for at $197 million. It's a tough job market out there, and that pessimism is weighing on Dice as the operator of career-specific job sites.

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Fool contributor Evan Niu holds no position in any company mentioned. Check out his holdings and a short bio. Try any of our Foolish newsletter services free for 30 days. We Fools don't all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.