The MoD said that the rule is designed to prevent sensitive information being placed on the internet, but it is thought that it could have an impact on social communications as well.
One solider told The Sun: "The fun police have taken over. I can't talk to my wife and kids or even play Call of Duty 5. Do they really think we're going to give away secrets?" Another added: "I am going to ignore it. A lot of the lads are going to do the same."