This is an interesting experiment to say the least. Instead of outright censorship, Google, Facebook, and Twitter are combatting propaganda with its own message as well.
Nearly half a million teenagers and young adults who had posted content with terms like “sharia” or “mujahideen” began last fall seeing a series of animated videos pop up on their Facebook news feeds.
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Source: [H]ardOCP – Tech Battles Extremist Thinking