There are many Muslims with even what some may describe as liberal or moderate views who support the ban too. The whole issue should not turn into a moderate vs extremist issue. We can disagree or agree over issues such as whether a face cover is valid in islam but whe it comes to issues surroundig our Prophet all Muslims should have a united stance.
I have no ideawhat is so valuable about facebook. The same people who use it keep in touch with their friends on HI5, Orklut, Msn Messenger, Yahoo Messengwer, Google Chat , Bebo not to foret face to face, mobile phones and landline telephones.
I see your point on the agenda to monitor extremists. They have been doing that ever since humans started to become more dependent upon electronic forms of communication which are more easily tracked and recorded.