Well, I've been having a mental wrestling match for a few weeks about Pinterest. If you read Pinterest's terms of service closely, if you pin something to Pinterest, you are agreeing that YOU have the copyright on what you're pinning and that you give Pinterest the right to resell the image. I find this troubling. I have just checked and a lot of my photos are repinned on Pinterest. If there was no clause that gave Pinterest the right to sell the images, I would not have a problem with that. I don't mind that there are people out there who like my photos and want to collect them into a collage. I do mind that Pinterest, without my permission, now has the right to sell my images to anyone they want to and make profit off that without me ever even knowing my images were submitted to Pinterest. So, all that being said, I am deleting my pinboards till Pinterest gets this figured out. Here is a great article on the topic. Click on the graphic to visit the article.
Update early April: Pinterest did change their terms to say they are not selling anyone's images. I still can't get motivated to check with every single person who owns the photos that I want to pin, though, so I probably won't be participating in pinterest any longer. I took down all my boards. I don't mind if you all pin my images, though, now that they will not sell them.