I couldn't figure out what changed from this page, so this is from their email to their users: We'd encourage you to read these changes in their entirety, but

I couldn't figure out what changed from this page, so this is from their email to their users: We'd encourage you to read these changes in their entirety, but we thought there were a few changes worth noting. Our original Terms stated that by posting content to Pinterest you grant Pinterest the right for to sell your content. Selling content was never our intention and we removed this from our updated Terms. We updated our Acceptable Use Policy and we will not allow pins that explicitly encourage self-harm or self-abuse. We released simpler tools for anyone to report alleged copyright or trademark infringements. Finally, we added language that will pave the way for new features such as a Pinterest API and Private Pinboards. We think these changes are important and we encourage you to review the new documents here. These terms will go into effect for all users on April 6, 2012.