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What: Shares of Internet security provider Websense (Nasdaq: WBSN) have plunged by 11% today after the company reported fourth-quarter earnings.

So what: Revenue was a tad lighter than hoped at $92.7 million compared with the $94.43 million that the Street was looking for. On the contrary, net income slightly bested forecasts by coming in at $0.44 per share.

Now what: Websense's first-quarter and full-year 2012 guidance left more to be desired, with first-quarter revenue expected between $88 million and $91 million and earnings per share of $0.30 to $0.34. The numbers fall short of the $92.2 million and $0.39 per-share profit that the market was looking for. Full-year guidance was gloomy as well, with the upper ends also not stacking up to expectations.

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