Call Mark Zuckerberg, the Winklevoss twins are back. As you may remember, the Winklevosses were made famous by the movie "The Social Network." It detailed their lawsuit against Zuckerberg for ownership of Facebook.

Since then, the twins have become venture capitalists, investing in tech companies, and now they're trying to get into another business: trading Bitcoin.

Here to talk about that is Nathaniel Popper, financial reporter for the New York Times.