Cameron Howard Winklevoss born August 21 1981 is an American cryptocurrency investor Olympic rower and cofounder of Winklevoss Capital Management and Gemini cryptocurrency exchange He competed in the mens pair rowing event at the 2008 Summer Olympics with his rowing partner and identical twin brother Tyler Winklevoss Winklevoss and his brother are known for cofounding HarvardConnection later renamed ConnectU along with Harvard classmate Divya Narendra In 2004 the Winklevoss twins sued Facebook founder Mark Zuckerberg claiming he stole their ConnectU idea to create the social networking site Facebook In addition to ConnectU Winklevoss also cofounded the social media website Guest of a Guest with Rachelle Hruska