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THE GENIUS OF SNAPCHAT After reading Joel Stein’s March 13 cover story about the tech company Snap, readers who don’t use its signature disappearing-message app wrote that they appreciated Stein’s “enlightening” them “as to what Snapchat is all about,” as Valerie Emmerich of Brookline, Mass., put it. But many noted that they still didn’t get the appeal. “Your past remains with you always,” Dr. Doris B. Hammett, of Asheville, N.C., pointed out. And it’s not