Only on one of them: - Your "friends" are known and tracked - The content you view is determined by your browsing history, ad tracking and that of your "frien

Only on one of them: - Your "friends" are known and tracked - The content you view is determined by your browsing history, ad tracking and that of your "friends" - The composition of the audience that's voting is poorly informed and susceptible to non-critical thinking (YMMV) On both of them: - Stories are posted to maximize your outrage/other emotional response - Content of stories rarely matches the titles Social interaction and even a like button is not the problem. What the like button does is the problem.