California Republican Devin Nunes filed a $250 million lawsuit against Twitter and a group of users Monday, accusing the social media platform of defamation and “shadow-banning conservatives.” The Congressman and former chair of the House Intelligence Committee filed the suit in Virginia state court accusing the social media giant of "negligence, defamation per se, insulting words, and civil conspiracy." “Twitter allowed (and allows) its platform to serve as a portal of…