I for one didn't read the thread or even really read the link before clicking on it, just saw the thread title and thought it was probably about slogan t-shirts or something. I will most certainly read more carefully in future. Also people need to click on the link to report through Facebook, not that they are taking any notice 
I have reported to the IWF using the link above, their site says they investigate every report and given that quite a few of us have reported, hopefully they will take it more seriously.
I've also contacted MNHQ as I think there needs to be a warning of how graphic this thread is in the title as it could be a trigger for people who have suffered sexual abuse.
InTheRedCorner go the IWF website to report it