With just $60 and internet access, researchers found and tracked NATO troops and even tricked...

The moral of this story is that OPSEC is even more relevant these days, because in an era of ubiquitous social media, an adversary doesn't even have to be in the same country as a target to gather information.

The details of this are unsurprising - people have huge online presences these days, so it's unsurprising that soldiers do too. It's worth noting that the researchers probably knew more about the exercise than an adversary would about an upcoming operation, which would certainly help their targeting.

The information gained by the researchers would be an excellent start in building an OPSEC briefing. In doing so, I'd point out to the troops being briefed the various ways the "adversary" gained information, and point out that in anything we do online, we need to consider what an adversary could do with the information.