Terrorists aren't exclusive to the middle east. In the united states you have domestic terrorists militias, religious cults, sovereign citizens, ELF, ALF, socialist extremist groups, and the Black Panthers. Then you have the international terrorists such as al queda, Hezbollah, HAMAS, IRA, ETA.
Some domestic groups might communicate through email and phone, but I doubt many do. Most would rather use messengers, encrypted channels, and the darknet. As for International groups, I doubt they communicate through yahoo mail. So no need to monitor those either.
If you want a secure country then put a few regiments of national guard on our southern border and destroy the Taliban in Afghanistan as well as Al Queda in the Middle East and Philippines.
