Social media is how ISIS recruits.
Maybe a bomb and a little information leak will reduce the number of future jihadists.
Catch your wife in bed with another guy.
Take a selfie in front of his house.
Sure but trained and authorized recruiters are not going put pictures of their secret headquarters on Facebook.
An untrained Facebooker with a smart phone may even leave his GPS enabled.
That would permit a GPS guided smart bomb to detonate within inches of where that Facebook post was made.
The smart thing (extreme) would be to confiscate every cellphone from their soldiers. Not as smart (or extreme) is to go from soldier to soldier and disable the GPS on each phone. Then make it clear that anyone using social media or enabling GPS on their phone will face severe punishment. Also make it clear that spot checks of phones will be coming.
If they want individual soldiers to recruit they should have it done under the watchful eye of trained individuals.
Of course any ISIS member should disregard everything I say because I am a Kafir.