Are the photos associated with a Twitter account? The reason I ask is because of the information I found at
This Site. Scroll down to the heading, "USERS" and read the first 3 lines. I went as far as to click on the example link and then a photo. After that, scroll to the very bottom to see:
"Are these your images? Want to delete them? Log in with Twitter."
I have camera+ installed and use it but I do not use the share function so if the information I found for you is incorrect or useless, my apologies.
Just Me, D
(iPhone 4S)