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Why Yelp Will Never Be Great Again

Yelp has been one of the market's hottest stocks lately, but as many as 20% of the reviews on the site may be fakes. Will the gains continue if the reviews can't be trusted?

Why Foursquare Is Beating Gowalla: Location

Check-in phenom Foursquare just passed 3 million users, a milestone that cements its growing lead in mobile social networking. But how did it outrace competitor Gowalla, which was born at the same time and with arguably better technology? By having the right real world social networks, of course.