I would just like to pop in here to say that just because YOU don't care if YOUR images are posted on Pinterest, you should still be aware that ANYTHING that YOU pin &/or RE-pin, without the express permission of the owner of the image, leaves you wide open for a lawsuit.
Read the following links:
http://blog.webcopyplus.com/2011/02/...-for-10-photo/
http://www.plagiarismtoday.com/2012/...nterest-users/