Some people have thousands of Facebook friends, while most do not. The same popularity principle applies to websites, baby names and books, studies show. But restaurants may be different, finds Tony Tong of the Duke Network Analysis Center. Using the number of comments a restaurant receives as a measure of its popularity, Tong analyzed nearly 60,000 restaurants in New York City. The top 5,000 most popular restaurants appear in yellow. The larger the dot, the more comments the restaurant received. A few restaurants are incredibly hot, and a few hardly get mentioned, but most are closer to the middle.