This past week had many New Yorkers indulging an amused horror over a curated set of images on the social-media site Tumblr titled "Rich Kids of Instagram." Photographs, outlined in gilded frames, depict the summer-holiday excesses of young people for whom Y.M.C.A. camp was apparently never on the horizon. Several revelers pay tribute to their imbibing on noncommercial modes of transportation.

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