It could be a specific staff message was coded in such a way as to single out intended personal and their respective responses, based on very specific terminology, logged through the firewall...or keylogging, with a view to terminating staff who use specific keywords...or something.
*Read: We're all going to die.
(,
Sun 12 Mar 2006, 1:35,
archived)
*Read: We're all going to die.