After suing Mark Zuckerberg, who started a digital currency exchange?
Gemini (digital currency exchange): Gemini is a digital currency exchanger started by the Winklevoss twins in 2015. Winklevoss twins: The Winklevoss twins (born August 21, 1981; also humorously referred to as the Winklevi or Winklevii) are American rowers and Internet entrepreneurs, Cameron Winklevoss and Tyler Winklevoss. Winklevoss twins:  In 2004, the Winklevoss brothers sued Facebook founder Mark Zuckerberg, claiming he stole their ConnectU idea to create the popular social networking site, and ultimately received $65 million.
The Winklevoss twins