I actually read the article in amazement, but apparently, the author is suggesting that to communicate effectively, terror organizations would need (and may already use) features similar to Facebook (to organize, network, poke each other and tag one another in drinking pictures), Wikipedia (to capture lessons learned), Advertising (I can only imagine the ads), and perhaps even a sort of Virtual World used for training simulations and seminars, similar to Second Life or World of Warcraft. I guess Osama Bin Laden might actually be in a cave somewhere screaming "Leeroy Jenkins!!!!!!"
As much as I joke about a terrorweb, it brings up a lot of issues. Most are unaware of the "Deep Web", "Darknet", and the "Dark Web"--portions of the Internet where Google and other conventional search engines haven't tapped into, that may comprise a vast porton of the Internet. How would one combat an organization that communicates on the Dark Internet? Could these networks be attacked through kinetic means (hacking), or could they be brought down through social engineering and infiltration?