The FBI and Department of Homeland Defense issued a new advisory this week, warning military members and people connected with the military to be careful about what they post online.
They are concerned certain social media posts might attract the attention of violent extremists who may commit ISIS-inspired attacks, though officials say the warning is not based on a new stream of threat information.
"Attacks and plots over the past three months -- involving alleged ISIL supporters acting in several Western countries after calls for attacks by group member -- suggest that ISIL's September 2014 endorsement of attacks against members of the military, law enforcement, and government personnel could embolden some violent extremists,” the advisory states.
One Iraq veteran, who spoke with NBC 7 on the condition of anonymity for protection, said many of his friends in the military are taking precautions online.
“I know quite a bit of them removed their Facebook posts, like they have albums from deployments; they've removed all the photos,” the veteran said.
Some have changed profile pictures and others deleted their accounts completely, he said.
The recent killings of Canadian soldiers by men inspired by ISIS have prompted additional awareness in the U.S.
A senior government official told NBC News that ISIS is consistently trying to inspire "homegrown" attacks.
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Many service members don't want to take any chances.
"I've had friends that have removed their entire Facebook, pretty much went blackout on social media entirely so they don't put their families at risk," the veteran said.
The Navy suggests using the following precautions when on social media:
- Make sure your privacy settings are up-to-date; know who can see your posts
- Don't discuss specific deployments and schedules
- Do not use geo-location apps or post addresses or phone numbers.
Above all, the Navy says be attentive and vigilant, but not fearful
Later this week, law enforcement agencies and military experts like NCIS will meet with military members and families looking for advice on social media safety.
