Myopenbar.com is a website that lists where drinks are free, according to this New York Times article. It was founded in 2005 by two friends and had over 30,000 subscribers in six cities (New York, Los Angeles, San Francisco, Chicago, Miami and Honolulu) by the end of 2008. The site has 30 employes and is profitable, according to the article.
Revenue models: advertising, events
