I would always defer to keeping your sorority affiliation to yourself unless it's made clear otherwise. The responses are as likely to be anything from disinterested to ambivalent to repulsed. Yes, there's a chance someone will be impressed, but it's not worth risking being outed as a dork, snob or just oddity just to brag about something from your college days.
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"Traveling - It leaves you speechless, then turns you into a storyteller. ~ Ibn Battuta
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