Suppose a distributed social network in which your node obeys other nodes' requests to delete mirrored data. Furthermore, let such data not be confined to the social network cache on your computer: you can export it out to your filesystem. Then, when a deletion request arrives, we need to find exported copies and delete them also. There needs to be some source tagging infrastructure built into the operating system or filesystem.
This gets especially hairy if the exported data has been subsequently modified or used to create other works. Should a derived work be deleted also? Automatic image, video, or text matching, or ask the human.
In another field, such thorough remote deletions could be evil, but these are always voluntary, friendly, the basis of the trust upon which the social network is built.
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