First things first: The only way to operate on Pinterest without the risk of running into copyright issues is only to pin your own work. Once you pin something from another site, you're stepping into an intellectual property scenario that is still playing out. Pinterest operates under the idea of fair use. Their users are commenting on the images, which, for the time being, makes them fair game for the site. That hasn't been tested in court, though, and it almost certainly will be in the future. Until then, know that the copyright situation surrounding Pinterest is a tricky one and thanks to the Digital Millenium Copyright Act, all of the liability for violations falls upon the users who do the uploading (or in this case, the pinning). Will you get arrested or sued for pinning images? Very unlikely. Will this get more complicated going forward? Almost certainly.