Facebook’s experiment on over half-a-million unsuspecting users has taken a new twist with the revelation that a researcher connected to a Department of Defense-funded program to use the military to quell civil unrest also participated in the study.

Social media sites exploded over the weekend after it was revealed that Facebook, no stranger to controversy of late, secretly manipulated posts being seen by nearly 700,000 users in 2012 in order to allow researchers to study how emotional states are transmitted over the platform.