Pinterest won't sell your content
For one, previously when a user signed up for Pinterest, the agreement said that Pinterest holds the right to sell user content. Silbermann said that selling content was never their intention and they've removed that clause from the agreement. Also, users cannot use the site for commercial purposes. Pinterest already tries to enforce the ethic of not just promoting yourself, but liking and repinning from other users. Now, they're adding, “We grant you a license to use the Service, including accessing and viewing Pinterest Content, for your personal, noncommercial use to allow you to express yourself, discuss public issues, report on issues of public concern, engage in parody and as expressly permitted by the features of the Service.”
While these changes in terms do not directly fix their copyright problems, it's a start. Image services like Getty have started adding HTML tags to their images, so they cannot be pinned. Other services, like Flickr will follow suit. However, ultimately, it is upto Pinterest to take copyrights seriously and set up a system of prevention rather than reporting the crime.