I recall reading an article a few years or more back where Russian military authorities were telling their troops not to post information about where they were involved in military operations to their social media accounts.
Not specifically because of the intel that could be farmed by Western agencies but because there were concerns that terrorist groups like Islamic State could use the information to target those soldiers (e.g. learn who they are, where their family is and then threaten their family) and force them to aid the terrorists.
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