If you have previously recommended this thread, you should see a tick / check mark on the recommend button. Click the tick to undo the recommendation (the tick may appear to change to a cross as you do this.) If you added a comment with your recommendation, you will need to delete that from your facebook wall separately.
Is it about the appraisal and capability policy? Our school have been balloted by NUT and NASWT regional reps for a school strike, which I haven't heard of before. The NUT rep said we would still be paid. Not sure how that would work, as I missed the meeting (so didn't cast my vote).