What constitutes 'violent and threatening' social media posts will be defined vaguely enough to include anything threatening the official government narrative. I remember several years ago a story about a man being involuntarily hospitalized for challenging the official 911 narrative on facebook.
http://www.businessinsider.com/brandon-raub-marine-911-detained-2012-8
I remember reading years ago all about Soviet Russia and how the state was putting people in psych wards and over medicating them for questioning the government narrative was common place! that's precisely where 21st century America is going