Yelp’s international sites have been growing like crazy, with non-U.S. traffic doubling in the past year. Today, it is adding a fifth non-English international site, Spain, to its roster. (The other international Yelp sites are in France, Germany, Austria, and the Netherlands).

Yelp is now at 50 million unique visitors per month, mostly in the U.S., according to its internal stats. ComScore shows 87 percent growth in non-U.S. unique visitors over the past year (Yelp’s internal stats show more than 100 percent growth).

Yelp is also seing growth along some other dimensions: reviews and mobile. Yelp now hosts 18 million customer reviews, with 2 million written in the first quarter alone and another million last month. Yelp’s reviews—both their number and quality—are one of the key pieces of content that differentiates it from other local sites.

Mobile is also growing at a nice clip. Yelp had 4 million mobile users in April, which is more than double where it was about year ago. Yelp’s iPhone and Android apps will be available in Spanish now as well.

Crunchbase

• YELP

Company: Yelp

Website: yelp.com

Launch Date: July 1, 2004

Funding: $56M

Another company founded in 2004 by two former PayPal employees. Yelp is a local reviews website covering the United States, Canada, the UK, Ireland, France, Germany, Austria and the Netherlands; Yelp drew an audience of more than 50 million unique visitors in March 2011. Yelpers have written more than 18 million local reviews, making Yelp the leading local guide for real word-of-mouth on everything from boutiques and mechanics to restaurants and dentists.

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