How free speech is under attack in the U.S.

When someone says something we disagree with, should we shut them up? In 1927, Supreme Court Justice Louis Brandeis had an answer: "The remedy to be applied is more speech, not enforced silence."

Well, in that case, the internet should have solved everything, notes correspondent David Pogue – it's nothing but more speech. And yet lately, the news is full of stories about people trying to limit other people's expression: