Nearly 1,000 freshmen trudged into O’Brien Stadium on Aug. 21. Among them was Haydn McMillen, a 19-year-old junior who transferred to Eastern Illinois University this fall. Up to that point, nobody on campus had approached McMillen, who was otherwise known as @haydnthecountryboy to his 188,000 followers on Instagram. Shortly after McMillen entered the stadium, he was ushered into the “I” of the EIU letters that freshmen and transfer...