This is an interesting article about Zachary Adam Chesser.
http://www.foreignpolicy.com/article...g_the_watchers

About the question if it is a good strategy to take down these videos instead of countering them with info-ops of ourselves, you should first determine the reason why these "facebook-terrorists" post them online and what effects they have.
On another note this world of jihadi-websites and would-be internet terrorists, could provide an excellent opportunity to do psuedo-operations and locate would-be terrorists.