Subsequent to the furore caused by Twitpic saying they own copyright to all pictures that you upload they have changed their terms as follows, which while accepting that you own copyright now to your own pictures, they retain the right to exploit those pictures for their own benefit :
“To publish another Twitpic user’s content for any commercial purpose or for distribution beyond the acceptable Twitter “retweet” which links back to the original user’s content page on Twitpic, whether online, in print publication, television, or any other format, you are required to obtain permission from Twitpic in advance of said usage and attribute credit to Twitpic as the source where you have obtained the content.
You retain all ownership rights to Content uploaded to Twitpic. However, by submitting Content to Twitpic, you hereby grant Twitpic a worldwide, non-exclusive, royalty-free, sublicenseable and transferable license to use, reproduce, distribute, prepare derivative works of, display, and perform the Content in connection with the Service and Twitpic’s (and its successors’ and affiliates’) business, including without limitation for promoting and redistributing part or all of the Service (and derivative works thereof) in any media formats and through any media channels.
You also hereby grant each user of the Service a non-exclusive license to access your Content through the Service, and to use, reproduce, distribute, display and perform such Content as permitted through the functionality of the Service and under these Terms of Service. The above licenses granted by you in media Content you submit to the Service terminate within a commercially reasonable time after you remove or delete your media from the Service provided that any sub-license by Twitpic to use, reproduce or distribute the Content prior to such termination may be perpetual and irrevocable.
You understand and agree, however, that Twitpic may retain, but not display, distribute, or perform, server copies of your media that have been removed or deleted. The above licenses granted by you in user comments you submit are perpetual and irrevocable. Deleted images are only accessed in the event of a legal issue. ”