The jihadis seem to be having a hard time figuring out that when the forum has a single admin, and the admin is imprisoned, that's pretty much the end of the forum. Two examples regarding the recently retired Ansar al-Mujahideen (Arabic) forum:

At Shmukh, and at Majahden.

[Update: That worked. The surviving admins decided to break cover and put the site back online :-) ]