This could never pass as constitutional. The consumers of media are not responsible for the content presented by media and the first amendment protects the speech coming form the user unless that speech is a direct physical threat. 

Re-posting, sharing and even pondering out loud or on keyboard about anything is protected freedom of expression...at least regarding the government. The social media companies can censor anything they want...but it seems Facebook and twitter are more concerned about conservative American speech being censored than the Islamic State.

Funny how the Left hates Christians due to so-called draconian beliefs...but loves Islam with draconian practices.