Late last week, Herald Sun had posted an article about how the Taliban has used Facebook to gather intelligence from Australian soldiers. What they did was create fake profiles with images of "attractive women" to socialise with the Australian soldiers with the intent of attaining confidential information. There were 3 Australian soldiers murdered within their base claimed to be the doings of an Afghan Army trainee.
A lot of their worries was that people can pose as friends from school or other acquaintances to gain trust, vital information such as geo-tagging "can be data-mined and sold to anybody", pointed out by Security expert Peter Hannay. There are arguments for total ban of social media from troops but for the moment they are working on 'social media guidelines' released by Christmas.
To some Facebook friends fits the category of people who they've met or known personally and adding people unknown would not have made sense, but there are people who would add or accept friends regardless. The latter group is probably more likely to lower their guard when using social media.
While I can understand why people want to ban social media in the military where information can be easily leaked in social media through photos, posts (with location tags), it is unclear what information is used against them by the Taliban. It could very possibly be that the soldiers communicating with the terrorist group lack common sense and are slightly gullible since it would not have made sense to even tell your family about your missions. Then again I've never been in the army and social media may be the only way they can reach the outside world what I would guess they are living in a very tense environment on a daily basis. What could Facebook or other social media platforms could've done to prevent similar cases from happening?