In more yoinking news, A Photo Editor points out that photo sharing web sites including Twitpic, Flickr, yFrog, Instagram, and others can sell your photos at profit. How can they do this? You allowed it when you signed up for the account and agreed to their Terms of Service.
The post over at APE points out that in their TOS, MobyPicture explicitly states that:
All rights of uploaded content by our users remain the property of our users and can in no means be sold or used by Mobypicture or affiliated third party partners without consent from the user. This means Mobypicture will NEVER sell the rights to your shared photos and videos. Your content is yours!