[relaunched]

Modern terrorist organizations like ISIS, for example, are loosely coupled, espousing an ideology and allowing "everyone to contribute" using their own skills. That means you have graphic artists, web devs, teens making videos, online communities, people working in sandwich shops spreading the word, someone with an idea asking for anyone who can help to do so...and so forth.

What this effectively means is that turning off the internet drastically inhibits the effectiveness of their distributed movement.