• NextWeb, Friday, April 8, 2011 12:13 PM

Recommendation engine StumbleUpon is now driving over 1 billion visitors to sites that have been "Stumbled," The Next Web reports. Earlier this month, Marc Leibowitz, StumbleUpon's VP of Marketing and Business Development, told The Next Web that the service had grown from 6 million to 15 million users in 2009.

StumbleUpon makes its money via advertised pages, which are presented via the same algorithm that dictates the rest of the content that you'll stumble. A fixed amount of money is paid for every recommendation of an advertised page. Those same social and curated signals that show you the cool stuff you're looking for are used to present targeted, relevant advertised pages.

"Leibowitz told us that StumbleUpon's mobile app is growing 40%, month over month, and has just crossed the 1 million install mark," The Next Web adds. "Clearly, mobile content and mobile browsing is a direction that SU will push in the future."

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