College partying and youthful misbehavior are by no means new, but after some parties spun out of control, at least in part, observers say, because of the ability of social media to draw young people to events — and to document behavior that then outrages residents who might not otherwise have noticed — cities and towns from Keene to Panama City Beach, Fla., are reconsidering or canceling gatherings that had been tolerated or encouraged in the past.

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