Twitter Tools – Google Analytics Tagger
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Tag all your URL's posted to twitter with Google Analytics tags using Twitter Tools
Twitter Tools – Google Analytics Tagger integrats with Alex King’s Twitter Tools to tag all the URL’s published with the Google Analytics Campaign.
The final URL will look like this: http://www.foo.com/?utm_source=twitter&utm_medium=post&utm_campaign=social
You can read more about it here: URL Builder