You just open the standard Photos app, press Edit in the upper right corner, select the photo or photos you want to delete (a check mark will appear on the selected images) and then select the red "Delete" button at the upper left.

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"The systems we used for photo storage a few years ago did not always delete images from content delivery networks in a reasonable period of time even though they were immediately removed from the site, " Facebook spokesperson Frederic Wolens told Ars via e-mail.

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When a photo or video is deleted, or when a person deletes his or her account, we delete all of the metadata for the content as well as any and all tagging and linking information.

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