Photo: Tony Ding, Associated Press  Michigan head coach Jim Harbaugh laughs and react to a referee on the sidelines in the fourth quarter of an NCAA college football game against Oregon State in Ann Arbor, Mich., Saturday, Sept. 12, 2015. Michigan won 35-7. (AP Photo/Tony Ding)  Michigan head coach Jim Harbaugh laughs and react to a referee on the sidelines in the fourth quarter of an NCAA college football game against Oregon State in Ann Arbor, Mich., Saturday, Sept. 12, 2015.  49er head coach Jim Harbaugh walks off after the win with Glenn WInston, (31) and Carlos Hyde, (28) as the San Francisco 49ers beat the San Diego Chargers 21-7 in pre-season NFL action at Levi's Stadium in Santa Clara, Calif., on Sunday Aug. 24, 2014.  49er head coach Jim Harbaugh walks off after the win with Glenn WInston, (31) and Carlos Hyde, (28) as the San Francisco 49ers beat the San Diego Chargers 21-7 in pre-season NFL action at Levi's Stadium in  San Francisco 49ers' head coach Jim Harbaugh in 2nd quarter of 19-3 loss to Seattle Seahawks in NFL game at Levi's Stadium in Santa Clara, Calif., on Thursday, November 27, 2014.  San Francisco 49ers' head coach Jim Harbaugh in 2nd quarter of 19-3 loss to Seattle Seahawks in NFL game at Levi's Stadium in Santa Clara, Calif., on Thursday, November 27, 2014.  San Francisco 49ers' head coach Jim Harbaugh holds his crying son, Jack, before the Niners play the Seattle Seahawks in NFL game at Levi's Stadium in Santa Clara, Calif., on Thursday, November 27, 2014.  San Francisco 49ers' head coach Jim Harbaugh holds his crying son, Jack, before the Niners play the Seattle Seahawks in NFL game at Levi's Stadium in Santa Clara, Calif., on Thursday, November 27, 2014.  San Francisco 49ers' Jim Harbaugh reacts in 2nd quarter of 19-3 loss to Seattle Seahawks in NFL game at Levi's Stadium in Santa Clara, Calif., on Thursday, November 27, 2014.  San Francisco 49ers' Jim Harbaugh reacts in 2nd quarter of 19-3 loss to Seattle Seahawks in NFL game at Levi's Stadium in Santa Clara, Calif., on Thursday, November 27, 2014.  San Francisco 49ers coach Jim Harbaugh, with wife Sarah, films a video with Dockers calling for the end of "dad pants" after last season's pleated khakis garnered buzz.  San Francisco 49ers coach Jim Harbaugh, with wife Sarah, films a video with Dockers calling for the end of "dad pants" after last season's pleated khakis garnered buzz.  49ers' head coach Jim Harbaugh yells to officials in the first half, as the San Francisco 49ers went on to beat the Carolina Panthers 23-10 in the NFC divisional playoffs in Charlotte, North Carolina on Sunday Jan. 12, 2014, at Bank of America stadium.  49ers' head coach Jim Harbaugh yells to officials in the first half, as the San Francisco 49ers went on to beat the Carolina Panthers 23-10 in the NFC divisional playoffs in Charlotte, North Carolina on Sunday  San Francisco 49ers coach Jim Harbaugh watches the second half of an NCAA college basketball game between Texas Tech and Kansas in Lawrence, Kan., Wednesday, March 5, 2014. Kansas defeated Texas Tech 82-57.  San Francisco 49ers coach Jim Harbaugh watches the second half of an NCAA college basketball game between Texas Tech and Kansas in Lawrence, Kan., Wednesday, March 5, 2014. Kansas defeated Texas Tech 82-57.  San Francisco 49ers head coach Jim Harbaugh is seen prior to the start on Monday night's game at Candlestick Park on Dec. 23, 2013 in San Francisco, Calif.  San Francisco 49ers head coach Jim Harbaugh is seen prior to the start on Monday night's game at Candlestick Park on Dec. 23, 2013 in San Francisco, Calif.  Jim and Sarah Harbaugh on their wedding day back in 2008.  Jim and Sarah Harbaugh on their wedding day back in 2008.  Head coach Jim Harbaugh of the San Francisco 49ers reacts on the sideline against the Green Bay Packers during their NFC Wild Card Playoff game at Lambeau Field on January 5, 2014 in Green Bay, Wisconsin.  Head coach Jim Harbaugh of the San Francisco 49ers reacts on the sideline against the Green Bay Packers during their NFC Wild Card Playoff game at Lambeau Field on January 5, 2014 in Green Bay, Wisconsin.  San Francisco 49ers' head coach Jim Harbaugh leaves the field after the 49ers defeated the Atlanta Falcons on Monday, Dec. 23, 2013 at Candlestick Park in San Francisco, Calif.  San Francisco 49ers' head coach Jim Harbaugh leaves the field after the 49ers defeated the Atlanta Falcons on Monday, Dec. 23, 2013 at Candlestick Park in San Francisco, Calif.  San Francisco 49ers head football coach Jim Harbaugh, who drove the pace car to start the Indianapolis 500 auto race, walks through the pit area before the start of the race at the Indianapolis Motor Speedway in Indianapolis Sunday, May 26, 2013.  San Francisco 49ers head football coach Jim Harbaugh, who drove the pace car to start the Indianapolis 500 auto race, walks through the pit area before the start of the race at the Indianapolis Motor Speedway  San Francisco 49ers coach Jim Harbaugh, left, walks with his brother John Harbaugh, coach of the Baltimore Ravens, at the NFL football annual meetings Tuesday, March 19, 2013, in Phoenix.  San Francisco 49ers coach Jim Harbaugh, left, walks with his brother John Harbaugh, coach of the Baltimore Ravens, at the NFL football annual meetings Tuesday, March 19, 2013, in Phoenix.  Safety Eric Reid, the first-round draft pick of the San Francisco 49ers, left, smiles as stands next to head coach Jim Harbaugh during a news conference at the team's training facility in Santa Clara, Calif., Friday, April 26, 2013.  Safety Eric Reid, the first-round draft pick of the San Francisco 49ers, left, smiles as stands next to head coach Jim Harbaugh during a news conference at the team's training facility in Santa Clara, Calif.,  1969 Indy 500 champion Mario Andretti, right, talks with San Francisco 49ers head football coach Jim Harbaugh, center, and entertainer Jim Nabors during the public drivers meeting for the Indianapolis 500 auto race at the Indianapolis Motor Speedway in Indianapolis, Saturday, May 25, 2013.  1969 Indy 500 champion Mario Andretti, right, talks with San Francisco 49ers head football coach Jim Harbaugh, center, and entertainer Jim Nabors during the public drivers meeting for the Indianapolis 500 auto  San Francisco 49ers head coach Jim Harbaugh is seen during the first round of the AT&T Pebble Beach National Pro-Am at the Monterey Peninsula Country Club on February 7, 2013 in Pebble Beach, California.  San Francisco 49ers head coach Jim Harbaugh is seen during the first round of the AT&T Pebble Beach National Pro-Am at the Monterey Peninsula Country Club on February 7, 2013 in Pebble Beach, California.  San Francisco 49ers head coach jIm Harbaugh hits his tee shot to the par-3 third hole at the Monterey Peninsula Country Club, during the first round of play at the 2013 Pebble Beach National Pro-Am golf tournament on Thursday Feb. 7, 2013, in Pebble Beach, Ca.  San Francisco 49ers head coach jIm Harbaugh hits his tee shot to the par-3 third hole at the Monterey Peninsula Country Club, during the first round of play at the 2013 Pebble Beach National Pro-Am golf  San Francisco 49ers head coach Jim Harbaugh answers a question during a news conference at the NFL football scouting combine in Indianapolis, Friday, Feb. 22, 2013.  San Francisco 49ers head coach Jim Harbaugh answers a question during a news conference at the NFL football scouting combine in Indianapolis, Friday, Feb. 22, 2013.  49ers coach Jim Harbaugh grabbed Alex Smith's jersey as he sent him back out in the fourth quarter. The San Francisco 49ers beat the Seattle Seahawks 13-6 in San Francisco, Calif at Candlestick Park,  49ers coach Jim Harbaugh grabbed Alex Smith's jersey as he sent him back out in the fourth quarter. The San Francisco 49ers beat the Seattle Seahawks 13-6 in San Francisco, Calif at Candlestick Park,  San Francisco 49ers head coach Jim Harbaugh watches from the sidelines agaist the Arizona Cardinals during the first half of an NFL football game, Monday, Oct. 29, 2012, in Glendale, Ariz.  San Francisco 49ers head coach Jim Harbaugh watches from the sidelines agaist the Arizona Cardinals during the first half of an NFL football game, Monday, Oct. 29, 2012, in Glendale, Ariz.  49ers coach Jim Harbaugh during the San Francisco 49ers game against the Seattle Seahawks at Candlestick Park in San Francisco, Calif., on Thursday October 18, 2012.  49ers coach Jim Harbaugh during the San Francisco 49ers game against the Seattle Seahawks at Candlestick Park in San Francisco, Calif., on Thursday October 18, 2012.  49ers coach Jim Harbaugh was outraged by a call by referee Walt Anderson in the fourth quarter. The San Francisco 49ers beat the Seattle Seahawks 13-6 in San Francisco, Calif at Candlestick Park,  49ers coach Jim Harbaugh was outraged by a call by referee Walt Anderson in the fourth quarter. The San Francisco 49ers beat the Seattle Seahawks 13-6 in San Francisco, Calif at Candlestick Park,  San Francisco 49ers Head Coach Jim Harbaugh argues a call with referee Walt Anderson during the fourth quarter against the visiting Seattle Seahawks at Candlestick Park in San Francisco, Calif. on Thursday, October 18, 2012. The 49ers defeated the Seahawks 13-6.  San Francisco 49ers Head Coach Jim Harbaugh argues a call with referee Walt Anderson during the fourth quarter against the visiting Seattle Seahawks at Candlestick Park in San Francisco, Calif. on Thursday,  San Francisco 49ers head coach Jim Harbaugh, right, reacts as he talks with referee Walt Anderson (66) during the second half of an NFL football game against the Seattle Seahawks in San Francisco, Thursday, Oct. 18, 2012.  San Francisco 49ers head coach Jim Harbaugh, right, reacts as he talks with referee Walt Anderson (66) during the second half of an NFL football game against the Seattle Seahawks in San Francisco, Thursday,  San Francisco 49ers head coach Jim Harbaugh, left, talks with quarterback Alex Smith (11) prior to an NFL football game against the Arizona Cardinals Monday, Oct. 29, 2012, in Glendale, Ariz. The 49ers defeated the Cardinals 24-3.  San Francisco 49ers head coach Jim Harbaugh, left, talks with quarterback Alex Smith (11) prior to an NFL football game against the Arizona Cardinals Monday, Oct. 29, 2012, in Glendale, Ariz. The 49ers  San Francisco 49ers head coach Jim Harbaugh reacts to a penalty called against his team during the first half of an NFL football game against the Minnesota Vikings Sunday, Sept. 23, 2012, in Minneapolis.  San Francisco 49ers head coach Jim Harbaugh reacts to a penalty called against his team during the first half of an NFL football game against the Minnesota Vikings Sunday, Sept. 23, 2012, in Minneapolis.  Jim Harbaugh talked with Frank Gore near the end of the game. The San Francisco 49ers defeated the Detroit Lions 27-19 at Candlestick Park Sunday September 16, 2012.  Jim Harbaugh talked with Frank Gore near the end of the game. The San Francisco 49ers defeated the Detroit Lions 27-19 at Candlestick Park Sunday September 16, 2012.  San Francisco 49ers head coach Jim Harbaugh tosses a football prior to an NFL football game against the Arizona Cardinals Monday, Oct. 29, 2012, in Glendale, Ariz. The 49ers defeated the Cardinals 24-3.  San Francisco 49ers head coach Jim Harbaugh tosses a football prior to an NFL football game against the Arizona Cardinals Monday, Oct. 29, 2012, in Glendale, Ariz. The 49ers defeated the Cardinals 24-3.  49ers head coach Jim Harbaugh yells at a referee questioning the spot of the ball in the fourth quarter at Mall of America Field in Minneapolis, Minnesota, on Sunday, September 23, 2012.  49ers head coach Jim Harbaugh yells at a referee questioning the spot of the ball in the fourth quarter at Mall of America Field in Minneapolis, Minnesota, on Sunday, September 23, 2012.  San Francisco 49ers running back Brandon Jacobs (45) is helped off the field by head coach Jim Harbaugh, right, in the first quarter an NFL preseason football game Saturday, Aug. 18, 2012, in Houston.  San Francisco 49ers running back Brandon Jacobs (45) is helped off the field by head coach Jim Harbaugh, right, in the first quarter an NFL preseason football game Saturday, Aug. 18, 2012, in Houston.  49er head coach Jim Harbaugh on the sidelines during the 49ers vs. the San Diego Chargers at Candlestick Park in San Francisco, Calif., on Thursday, August 31st, 2012.  49er head coach Jim Harbaugh on the sidelines during the 49ers vs. the San Diego Chargers at Candlestick Park in San Francisco, Calif., on Thursday, August 31st, 2012.  San Francisco 49ers head coach Jim Harbaugh yells during the second half of an NFL preseason football game against the Denver Broncos in Denver, Sunday, Aug. 26, 2012.  San Francisco 49ers head coach Jim Harbaugh yells during the second half of an NFL preseason football game against the Denver Broncos in Denver, Sunday, Aug. 26, 2012.  San Francisco 49ers head coach Jim Harbaugh watches the scoreboard during an NFL football game against the Green Bay Packers Sunday, Sept. 9, 2012, in Green Bay, Wis.  San Francisco 49ers head coach Jim Harbaugh watches the scoreboard during an NFL football game against the Green Bay Packers Sunday, Sept. 9, 2012, in Green Bay, Wis.  San Francisco 49ers head coach Jim Harbaugh catches a ball before an NFL preseason football game against the San Diego Chargers in San Francisco, Thursday, Aug. 30, 2012.  San Francisco 49ers head coach Jim Harbaugh catches a ball before an NFL preseason football game against the San Diego Chargers in San Francisco, Thursday, Aug. 30, 2012.  Detroit Lions head coach Jim Schwartz, left, shakes hands with San Francisco 49ers head coach Jim Harbaugh at the end of an NFL football game in San Francisco, Sunday, Sept. 16, 2012. San Francisco won 27-19.  Detroit Lions head coach Jim Schwartz, left, shakes hands with San Francisco 49ers head coach Jim Harbaugh at the end of an NFL football game in San Francisco, Sunday, Sept. 16, 2012. San Francisco won 27-19.  San Francisco 49ers coach Jim Harbaugh and his caddie 49ers quarterback Alex Smith walked up the fourth fairway Thursday, February 9, 2012 during opening rounds of the annual AT&T Pebble Beach National Pro-Am golf tournament in Pebble Beach, Calif.  San Francisco 49ers coach Jim Harbaugh and his caddie 49ers quarterback Alex Smith walked up the fourth fairway Thursday, February 9, 2012 during opening rounds of the annual AT&T Pebble Beach National Pro-Am  San Francisco 49ers head coach Jim Harbaugh, left, listens to replacement line judge Eric Hoffman during the second half of an NFL football game against the Minnesota Vikings Sunday, Sept. 23, 2012, in Minneapolis.  San Francisco 49ers head coach Jim Harbaugh, left, listens to replacement line judge Eric Hoffman during the second half of an NFL football game against the Minnesota Vikings Sunday, Sept. 23, 2012, in
Although the tweet doesn't directly mention Tomsula or the 49ers, it's hard to believe Harbaugh's thoughts were on another topic.