GM's North America President Mark Reuss deactivated his Facebook page after responding to a story on TheDetroitBureau.com about the automaker.

Mark Reuss, General Motors’ North American president, deactivated his Facebook account yesterday after disputing portions of a story on TheDetroitBureau.com about GM’s shrinking market share.

“Mark made a personal decision to deactivate his page,” Terry Rhadigan, GM spokesman, told TheDetroitBureau today. “It had nothing to do with the article or any other articles.”

The story, which ran yesterday, chronicled concerns the General Accounting Office (GAO) had about GM’s competitiveness. The GAO, which outlined its concerns in a report, monitors the U.S. Treasury Department’s investment in the Detroit maker following its 2009 bankruptcy.

“GM faces continued challenges to its competitiveness. For instance, its market share of vehicles sold in North America remains smaller today than in 2008. Furthermore, GM continues to carry large pension liabilities,” the report noted.

(To check out the DetroitBureau’s original story on GM’s eroding market share, Click Here.)

Reuss took to the social media site to defend the company’s struggles, noting that it has had a recent uptick in market share.

“Fact: In mid stream of introducing 28 new models, GM has gained a half a point of retail share, and reduced dramatically fleet dependance to drive resale and residual value to build back the brands. GM now sells more vehicles with 4 brands than 8, and grown retail share and dealer profitability–driving margins to 9.3% in Q3,” he wrote.

“As mentioned, each new model is award winning–and models such as the CTS and Corvette–along with month 2 of Silverado and Sierra in full swing. Our Average Transaction Prices (ATP’s) are industry best, and incentive loads in check. No excuses–but NA is disciplined, focused, and executing.

“Last month we ran mid 18% share as the plants turn new product and the pipes fill. Exiting BK with the oldest portfolio in the industry took discipline and product focus–nothing worthwhile happens in one year or day or week of share reporting. We have one shot and we are doing it right–with great dealers and facilities.”

(Click Here to see Chevy’s entries at SEMA.)

GM’s U.S. market share in the first nine months of 2013 was 18%, compared with 17.9% for 2012 and 22.2% in 2008, according to industry research firm Autodata Corp.

The GAO report as well as the TDB story noted the positives of the company, including “positive financial results” and “positive and growing cash flow, and a stable liquidity position.”