maybe we need a Flickr specific policy/guide like http://commons.wikimedia.org/wiki/Commons:Precautionary_principle or put more emphasis on the precautionary principle with living people change it from significant doubt to plausible doubt, where the onus for undeletion requires the photographer to establish permission.
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GN.
Photo Gallery: http://gnangarra.redbubble.com
Gn. Blogg: http://gnangarra.wordpress.com