General Motors Co. didn’t just halt Twitter advertising after Elon Musk bought the social network. The Detroit automaker’s chief executive officer and vehicle brands haven’t even tweeted since.
Mary Barra last posted on Oct. 27, the same day that Musk closed his $44 billion purchase, when GM’s leader retweeted a message from autonomous-vehicle startup Cruise LLC. Since then, Barra and GM’s consumer-vehicle brand accounts -- including Chevrolet, Cadillac, Buick and GMC -- have been conspicuously quiet.
