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What: Shares of Vocus (NASDAQ:VOCS) got crushed today, down by as much as 24% at the low, after the company reported fourth-quarter results along with soft guidance.

So what: Revenue in the quarter was $47.1 million, which was a 54% increase from a year ago. Non-GAAP net income was $3.9 million, or $0.16 per share. The company said it added almost 1,400 net new annual subscription customers during the last quarter of the year, finishing with almost 16,500 active annual subscription customers.

Now what: Guidance for the current quarter is calling for revenue of $46.3 million to $46.7 million, with non-GAAP earnings per share of $0.09 to $0.10. For the full year 2013, top-line sales should be $200.3 million to $201.8 million, with bottom-line adjusted profits of $0.50 per share to $0.53 per share. Investors were expecting first-quarter revenue of $49 million and full-year revenue of $208.7 million.

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Fool contributor Evan Niu, CFA, has no position in any stocks mentioned. The Motley Fool has no position in any of the stocks mentioned. Try any of our Foolish newsletter services free for 30 days. We Fools may not 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.