Mark Zuckerberg promises change, but Facebook has failed to follow through in the past

Facebook founder Mark Zuckerberg broke his silence about what he acknowledged was a "breach of trust" with the public, after news investigations found Cambridge Analytica improperly obtained data on 50 million Facebook users. Zuckerberg also said steps had been taken to prevent these problems before. Hari Sreenivasan gets reaction from Tim Wu of Columbia Law School.

(Source: PBS NewsHour,