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As far as I know this is a very local practice. It originated with Pappas' restaurant in Tarpon Springs (now in other places as well). The Pappas' potato salad is a simple one, the potatos doused w/vinegar, mixed with chopped scallions and mayonnaise, lots of salt, little pepper. I have no idea the why of this but am sure of the where: Tarpon Springs, the huge Greek community.
