During his time with Michigan football, Jim Harbaugh has become rather famous for his Twitter spats in the offseason. Some of his best include a rebuttal to Tennessee head coach Butch Jones and his indirect shot at San Francisco 49ers management.
The newest feud is with former NFL running back Brandon Jacobs, who played for Harbaugh in San Francisco for the 2012-13 season.
During a CBS Sports radio interview, Jacobs said Harbaugh had “no idea what he was doing” as head coach of the 49ers. As head coach, Harbaugh took the 49ers to three straight NFC Championship Game appearances and a Super Bowl from 2011-13.