Facebook Exposes Employee Data To Terrorists

An anonymous reader writes: The Guardian is reporting that Facebook accidentally exposed the personal information of the moderators that remove terrorist content to the groups that posted that very content. From the article it looks like 6 of them actually had their profiles viewed. From the article, "The security lapse affected more than 1,000 workers across 22 departments at Facebook who used the company's moderation software to review and remove inappropriate content from the platform, including sexual material, hate speech and terrorist propaganda." What are Facebook's responsibilities here?