Why would Islamics spend all those resources on such an esotric means of communication when they can just go to the Mosque and make their plans in plain language?
You have to give them some credit for ROI (return on investment.) I mean they brought down the WTC with a couple of razor blades.
Or just have multiple people log into the same email account, and leave messages in draft form for others to view?
You think all messages into America from S.A., Jordan, Syria, and Iran are by word of mouth?