Blocking only Facebook Apps

We have differents company here, they would only block the Apps from Facebook. Facebook self could be open. It give a methode to block only the Apps by firewall. If we haven't a methode we must block facebook in difference bigger companies...

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hm.. have you tried to analyze how facebook implements those apps and just filters them out by some URL filters or so?

Well, if you can filter by some URL pattern, then block
All the applications are served from that domain.