Yelp is not doing so well. They were valued at $5B, but since going public it's not been good: http://www.cnet.com/news/yelp-is-in-a-death-spiral-industry-expe

Yelp is not doing so well. They were valued at $5B, but since going public it's not been good: http://www.cnet.com/news/yelp-is-in-a-death-spiral-industry-expert-says/ http://www.cnet.com/news/yelp-is-in-a-death-spiral-industry-... Their stock dropped 28% this week on poor earnings.