Question: Which former roommate of Mark Zuckerberg owns 53 million Facebook shares? 
Sentence (from "History of Facebook"): The website's membership was initially limited by the founders to Harvard students, but was expanded to other colleges in the Boston area, the Ivy League, and gradually most universities in the United States and Canada, corporations, and by September 2006, to everyone with a valid email address along with an age requirement of being 13 and older.
Relevant evidence: No