Seems user C2hristina has a vote farm, upvoting his own submissions and downvoting users comments. : reddit.com
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MrBabyMan: Digg Users Revolt, Against the One Pure Man at the Top - ReadWriteWeb
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effektz's multi-user multi-site stolen-image spam campaign on Reddit, Digg, StumbleUpon, Del.icio.us, and others
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Notation: * = Private bookmark and comment|… = Clipping [?] | … = Public highlight [?]
