Yelp

Yelp should fear Google!  Although Yelp has cornered the market on combining customer review and social networking, their inability to capitalize and make money on its established infrastructure leaves them vulnerable to Google's massive market and resources.  As a Yelp user, I believe Yelp's best bet is to position itself for buyout from a larger company such as Google or Facebook.  In the interim, Yelp must learn how to bring in revenue quickly.  Freemium, subscription service, and per click charges may help, but they must figure out how to link review to local business that want to compete with larger corporations, their target market.