Sen. Ed Markey (D-Massachusetts) fired back at Elon Musk after being mocked by the billionaire at a Twitter exchange. Musk made fun of Markey after the senator requested information about Twitter’s new and controversial verification policy. “One of your companies is under an FTC consent decree. Auto safety watchdog NHTSA is investigating another for killing people,” Markey wrote. “And you’re spending your time picking fights online. Fix your companies. Or Congress will.” Markey’s comments came after a Washington Post reporter was able to impersonate his profile by creating a Twitter Blue accou…