The brazen casual encounters site that gained notoriety as UChicago Hookups is spreading like the cl— hmm . . . well, it’s spreading. After changing its name to eduHookups last week, the site opened registration on Monday to people with Columbia College and Northwestern e-mails; it launches for DePaul and Loyola students at midnight, Yale and Washington University on Friday, and Brown next Monday. Earlier this week it reported having a modest 800 registered members, but as it expands across college networks, the site seems poised to go viral, Facebook-style.