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Many schools coach their athletes in social-media smarts. The athletic department at Pepperdine University doesn't monitor but does drill a basic lesson: any tweet can come back to haunt you. Alina Ching, a sophomore golfer at Pepperdine, is glad her school takes such a hands-off approach. "I would feel that my privacy is invaded and that I'm treated like I'm in middle school," Ching says. "We're all adults now. I can figure it out."