A number of Bay Area companies have come to incorporate this insight into their marketing strategies. In 2004, shortly after launching the restaurant-review site Yelp, the founders were struggling to grow the company. They decided to convene a gathering of about 100 power-users. The get-together “was a big success,” Ligaya Tichy, who later served as Yelp’s senior community manager, told me. “Bringing users together to share what they loved about the site led to a huge spike in activity. What we realized is that people aren’t really motivated by companies. They’re motivated by other people. We needed to get the message across: you are what makes this product cool.” The number of reviewers on the site grew from 12,000 in 2005 to 100,000 in 2006.