Facebook CEO Mark Zuckerberg promised earlier this week that the social-networking service would make it easier for users to manage their privacy on the site, after Facebook came under fire for recent changes to its privacy policies.

The company, which has more than 450 million users, introduced new features in April that extended Facebook's network to more places on the Web. But some users objected to the fact that changes limited what information they could keep private, or made privacy settings more confusing.

Mr....