Jim Harbaugh is a social media superstar, not because he's online all the time -- that'd be wild given that he's an NFL coach -- but because fans love to focus on the quirky guy at the helm of the Los Angeles Chargers (I don't know, maybe it's because of the khakis ).

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Incredible,” Harbaugh says upon his return Tuesday to the University of San Diego, where he began his head coaching career in 2004. The team will practice there again Wednesday.