mymarks
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Dark Visitors - A List of Known AI Agents on the Internet
https://darkvisitors.com/
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flexplore
http://flexplore.raum-fuer-notizen.de/
does some sort of interesting statistical analysis of what you like of flickr, and finds more of it
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Worst agents in publishing
http://absolutewrite.com/forums/showthread.php?t=28961
This one's for you, TNH