Not sure about "preventing", but a great solution to this problem would be a sort of recommendation system that would show each user articles that other users "

Not sure about "preventing", but a great solution to this problem would be a sort of recommendation system that would show each user articles that other users "like" them generally wanted to see. We don't all like the same music, and there's little reason to think we all want to read (or flag) the same articles, either.