Nighthawk x6 R8000 will not block facebook

I have Block sites enabled on a schedule and all the other sites I have entered are blocked when I try to access them during the schedule.  However, facebook, entered as many different ways as I can will not block.  What gives.  I block apple, itunes.com, giga-byt, microsoft, and about 10 others without problem.  Is facebook paying netgear to always leave them open or am I doing something wrong.

Thanks