secret society

so do you sororities have secret rules like don't befriend other sororities, don't talk to non-greeks, ignore these people, what do you guys talk about, what do you guys do all day, study get drunk, it's so weird, I'm just figuring out this school is run by greeks, for awhile I thought no one had any social skills, but then I look up facebook photos and see you guys in groups of like 100 and you all seem like friends, where are you guys on campus? it's like your lives are happening in secret? is this apart of the design? are you guys supposed to keep your lives secret or something?