With Facebook No Longer a Secret Weapon, Egypt’s Protesters Turn to Signal

All Egpyt has to do is to block Singal's servers IPs and effectively take it offline.

This is what Gulf regimes already do (I know for sure it's blocked in UAE and Oman since I have tried).

Signal with a built in tor client that automatically bridges using obfs would be extremely powerful. A lock screen that destroys messages after x number of attempts is a good bonus (similar to threema).