Zuckerberg’s Response Doesn’t `Cut It,’ Facebook Critics Say

• CEO vows to investigate leak, audit all third-party apps • Lawmakers say he must still testify; analysts question impact

Facebook Inc. CEO Mark Zuckerberg broke his silence on the crisis over political-advertising firm Cambridge Analytica’s access to user data on the social network, outlining concrete steps the company is taking to make sure such a leak doesn’t happen again. Critics were underwhelmed.

The billionaire finally spoke in a series of media interviews, and a blog post, promising to probe the extent to which “rogue apps” are harvesting sensitive data on the social network. Zuckerberg told CNN that Facebook would inform every one of ...