How Social Media Affects Our Democracy

Back in 2010, Eric Schmidt, then-CEO of Google, had a vision for a personalized web. He said, in a Wall Street Journal interview, that one day, "technology will be so good, it will be very hard for people to watch or consume something that has not in some sense been tailored for them."

Of course, Schmidt was exactly right — think Netflix, Pandora, Google News.

But, according to Harvard Law professor Cass Sunstein, that personalization, especially on social media, has also isolated us, polarized our political parties and divided our democracy.

Cass Sunstein, professor at Harvard Law School and author of "#Republic: Divided Democracy In The Age Of Social Media." He tweets @casssunstein.