Well, here’s yet another photo-sharing site that brazenly declares that all material you upload actually belongs to them to do with as they wish:

http://rmbr.com/

The relevant text from their Terms of Service is as follows:

You give us permission, for now and for the future, to use, copy, perform, display, and distribute your Customer Content and to prepare derivative works of, or incorporate into other works, such Customer Content, and to grant the same permissions to others. This permission is permanent and can’t be taken back. This permission is given to rmbr in return for use of the rmbr service, and not for any fee payable by rmbr, and shall continue to apply even after you cease using the rmbr service (e. g. so we can keep copies for our archives).