Well, seem like a new exchange is up. Not sure if there is thread in Bitcointalk (search function is not working..). If there is, feel free to delete this.
http://mashable.com/2015/01/23/winklevoss-brothers-gemini/Not a normal exchange, you can use the money you keep inside to buy insurance from FDIC.
Also, let's discuss on one of their prediction..
In December 2013, Cameron Winklevoss predicted that in the future, the price of one bitcoin might go as high as $40,000.
Those twins will make Cryptoo currency bigger then facebook indeed .
What's the website of this new exchange , seems interessting if you ask me .and for they prediction , can we say they failed hard ? (that if they meant "in the future" = 1-2 years)