Michigan coach Jim Harbaugh has never been shy on social media (or any other media for that matter).
His Twitter account started drawing widespread attention shortly after he arrived in Ann Arbor when Harbaugh mastered the art of subtweeting -- well-timed "quotes of the day" that seemed specifically tailored for his detractors. Recently, he has been less subtle when tweeting at "the Georgia coach" and his "Rocky Top colleague." The outspoken coach does things differently than his peers in many aspects of his job, and many of those departures from the norm are for the benefit of his team.