Slapping therapy

I don't know why there's so much controversy over slapping therapy and whether it improves mental well-being.
I've just slapped
I've just slapped
Spoiler:
Website is currently experiencing unusually high level of visits
http://icserver.no-ip.biz/coventry/
http://icserver.no-ip.biz/coventry/viewtopic.php?f=19&t=84277