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 Yelp (NYSE:YELP) tanked today by as much as 12% after the company announced third-quarter results.

So what: Revenue in the third quarter came in better than expected, with the online-review specialist bringing in $36.4 million. That translated into a net loss of $2 million, or $0.03 per share. That bottom line was also slightly ahead of the $0.04 per share loss that analysts were expecting.

Now what: Investors might have been looking for a little more from fourth-quarter guidance, which calls for revenue in the range of $40 million to $40.5 million, which would be growth of around 62%. Near-term margins may also be under pressure due to the acquisition of Qype. Yelp had preannounced preliminary figures last week, so it seems investors were focusing more on guidance and were left wanting more.

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