Senate Democrats Edward Markey and Richard Blumenthal introduced "privacy bill of rights" legislation today shortly before Facebook CEO Mark Zuckerberg was scheduled to testify in a Senate hearing about the Cambridge Analytica data scandal.

Why it matters: It's the first concrete piece of legislation to come from the Facebook controversy, and the first recent attempt to apply privacy to web companies like Facebook and Google. The bill would direct the FTC to require companies to get consumers' opt-in consent before using, sharing or selling their personal information.