members join more than one: no
public defeats purpose: not entirely, as people would still be able to 'belong' to their own selected group of friends
way to join more than one: no, THAT would defeat the purpose. you may as well just have regular forums then. if someone wants to post in not their dorm, they can just post in the public thread of that dorm. (or if they want to switch, they quit the first and join the new)
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