Last year around November 2, 2016, a bug caused the activity log of Facebook (FB) groups to expose the profiles of its content moderators.   The bug involved the creation of this exposure whenever an administrator was removed for breaching the terms of service (TOS.)  Personal details of moderators who had censored accounts as early as August 2016 were then made viewable to the remaining FB group administrators.

Unfortunately, approximately 40 of those 1,000 content moderators worked in a counter-terrorism unit at Facebook's European headquarters in Dublin, Ireland.  Within those 40, it was determined that at least six had their personal profiles viewed by potential terrorists from US State Department designated groups Hezbollah, ISIS, and the Kurdistan Workers Party.

The detection of the exposure was first suspected when moderators began receiving friend requests from known suspects of the terror organizations they were tasked with analyzing.  Some of the moderators are contractors who are only paid just $15 per hour for scouring often high-disturbing material written in other languages.  Facebook policies allow disturbing imagery with the caveat that it doesn't promote or celebrate terrorism.