Not for sharing. I got news for you.
I read their Terms and Conditions, and this is what they say:
"You grant Pinterest and its users a non-exclusive, royalty-free, transferable, sublicensable, worldwide license to use, store, display, reproduce, re-pin, modify, create derivative works, perform, and distribute your User Content on Pinterest solely for the purposes of operating, developing, providing, and using the Pinterest Products.
http://about.pinterest.com/terms/
Furthermore, Pinterest and its users may retain and continue to use, store, display, reproduce, re-pin, modify, create derivative works, perform, and distribute any of your User Content that other users have stored or shared through Pinterest."