Expletive-laden post came after singer's sound was cut during Austin City Limits music fest
                                
                                
                                    (Newser) -
                                    If you're wondering how Phoebe Bridgers' performance went over the weekend at the Austin City Limits music fest, her three-word tweet shortly afterward sheds some light. "lol f--- acl," the 27-year-old singer-songwriter said in a since-deleted post, per  Pitchfork . The tweet was sent about 17 minutes after...