hi5 is a social networking website based in San Francisco, California. The company was founded in 2003 by Ramu Yalamanchi. By 2008, comScore reported that hi5 had become the third most popular social networking site in terms of monthly unique visitors.

Bill Gossman was appointed CEO in April 2009, and since that time, hi5 has refocused itself as a social gaming platform and opened itself to new game developers. Gaming industry veteran Alex St. John joined the company as President and CTO in November 2009, and in early 2010, hi5 acquired social gaming company Big Six. The company raised $20 million in series A venture capital from Mohr Davidow Ventures, as well as $15 million in venture debt, in 2007, and announced it had raised $3 million convertible note from existing investor Mohr Davidow, bringing the funding up to $38 million. Quantcast reports hi5 has 2.7 million monthly US visitors and 46.1 million global visitors. Software-industry veteran Karen Richardson has served as chairwoman of the company’s board since 2008.

In December 2011, the social networking site, Tagged, purchased Hi5 for an undisclosed sum

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