I think it really would depend on what the twins want and what their relationship is. My D is at a LAC and knows a set of identical twins who are both in her class there. It doesn’t seem to be an issue. They are close, but they have also branched out and done their own thing. My D knows one of the twins from her sorority (only one twin joined) and she knows the other twin from classes. The twins also took different semesters abroad so they were apart in terms of school for a year but I don’t know if that was by accident or design.