Pinterest is a sharing site and not a product promotion site. Just like Twitter is taking strict action against spammers Pinterest is soon going to come down heavily against those who spam their system
I have just come to know about that, actually I have been away from this forum from a month and thanks I have come to know about it from the post and will certainly have a look on that.
They should take similarly strict action against THEMSELVES, their website is nothing but a huge copyright infringement party.