(Reuters) – Facebook Inc co-founder and former Mark Zuckerberg roommate Chris Hughes has called for the break up of the social network in an opinion piece in the New York Times.

FILE PHOTO: Chris Hughes, co-founder of Facebook, speaks at the Charles Schwab IMPACT 2010 conference in Boston, Massachusetts October 28, 2010. REUTERS/Adam Hunger

“We are a nation with a tradition of reining in monopolies, no matter how well intentioned the leaders of these companies may be. Mark’s power is unprecedented and un-American,” Hughes wrote on Thursday.

Facebook owns the largest social network with more than 2 billion users across the world. It also owns WhatsApp, Messenger and Instagram, each used by more than 1 billion people.

Hughes co-founded Facebook in 2004 at Harvard with