Four years ago, Stacy Snyder, then a 25-year-old teacher in training at Conestoga Valley High School in Lancaster, Pa., posted a photo on her MySpace page that showed her at a party wearing a pirate hat and drinking from a plastic cup, with the caption “Drunken Pirate.” After discovering the page, her supervisor at the high school told her the photo was “unprofessional,” and the dean of Millersvil
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