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It looks like there is a canonical tag on the Facebook version of the site but it's still not a great idea. Unless there is a really good reason I'd remove the site. Craig

You need to remove all the offending links ASAP. Its seems PR blog networks are causing it. Dont worry, your not the only one going through this, over 700,000 people got the message http://searchengineland.com/google-sent-over-700000-messages-via-webmaster-tools-in-past-two-months-113807