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.
Just wanted you to know, I've been TRYING to join that other forum you told me about but I keep stuffing up the registration. It insists that my username is already in use and so is my email but I think it's just some kind of dumb digital hitch as I've yet to make it past the registration page. And there's nowhere I can spot for help with registering.
But I didn't want you to think I was just lying around here eating chocolates...