The gunman believed to be behind a fatal mass shooting in Thousand Oaks, California, on Wednesday night posted a Facebook message before he opened fire on the crowd at Borderline Bar and Grill, killing 12. CNN reports that authorities located a Facebook post they believe was  made by Ian David Long shortly before the mass … Continue reading Thousand Oaks gunman posted chilling Facebook message mocking response to mass shootings; frequented bar where he later killed 12 people: Report