choosing roommate for sophomore year housing

<p>So I'm currently at one of NYU's portal campuses and for housing next year, I wanted to dorm with someone new rather than with a friend since I don't know anyone at the washington square campus and I thought I could get to meet more people that way.
I'm just wondering though, do sophomores have to request a roommate, or can they be randomly matched up with someone?
If you can, how common is it to do that as a sophomore (do most people choose their own roommate?)
Thanks guys!:)</p>

<p>Also, is there's a site/fb page etc somewhere that people use to find roommates? I'd love to try that out.</p>