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It looks like your WP install is handling the canonical tag in a couple different ways because I see multiple canonical tags on multiple pages.
In WP for SEO I prefer to use Yoast to the All in One SEO. Yoast has an advanced section in Meta that gives you an input to your canonical URL.
It appears that that one of your canonical tags is correct. Example I found was on this page
rel="canonical" href="http://www.cisaz.com/blog/2011/facebook-offers-tutorial-businesses/" />
Yahoo use to be the only ones who really took this into account, but since last year when Bing started running the technical side of their engine as well this pretty much become insignificant across the board. Bing tries to be more and more like Google every day so I believe that taking time to use the tag (even though it may only take a measly minute or so) after you know the target keywords for your piece of content I still think the disadvantage of also showing your competitors what terms you are trying to rank for outweighs the hypothetical pro of thinking people still take this into account.