It seems that Ad agencies are lifiting photos from Flickr and using them in their campaigns without permission and without model releases from the people appearing in the photos.
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In the process of reviewing my images on Photobucket I discovered one photo had mysteriously been renamed and was in a file format that I don't use. I have no idea what this is about. I deleted the image and I am in the process of deleting all other images too.
I will probably continue to use Photobucket but I will expire my images much more quickly and I will start keeping a very close eye on what is being done.
I urge you to do the same. It's a jungle out there. Be careful.