Yelp filed for an initial public offering today. Here are some of the interesting numbers in the filing.

Net revenue for the first nine months of 2011 was $58.4 million, up 80 percent from a year earlier. About $40 million came from local advertising, $12.6 million from brand ads, and $5.4 million from other.

Yelp is seeking to raise about $100 million. The company has $23 million in cash.

Yelp lost $7.6 million for the nine-month period, compared to a loss of $8.5 million a year earlier.

The company has 22 million reviews on businesses as of Sept. 30, up 66 percent from a year ago. Yelp says there are more than 27 million businesses in the U.S., according to the Census Bureau. Those local businesses spent $19.6 billion on online ads and $113.6 billion on traditional offline ads in 2010.

The service has 61 million monthly unique visitors, up 63 percent from a year ago.

Some 529,000 local businesses have claimed their locations on Yelp.

Yelp is in 65 markets around the world, compared to 49 a year ago.

Every second or so, a consumer looks up directions to or calls a local business from a Yelp mobile app.

Yelp recognized revenue from 19,000 active local business accounts for the quarter ended Sept. 30, up 75 percent from a year ago.

The average Yelp review has more than 100 words.

During the quarter ended Sept. 30, contributors submitted over 25,000 reviews per day.

About 23 percent of businesses that have been reviewed are restaurants and another 23 percent are shopping locations. About 10 percent are home and local services, 9 percent are beauty and fitness, 8 percent are arts and entertainment and events, 5 percent are health, 4 percent are auto, 4 percent are nightlife and 4 percent are travel and hotel. About 10 percent are other.

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