Back in March of 2008, Rand Fishkin wrote a blog post in which he indicated that Google uses the first link between any two pages that is found in the source. The post puzzled many people including Ray “Catfish” Comstock of BusinessOnLine.
Comstock was so bewildered by the post that he and several colleagues conducted their own research on the issue and found it to be accurate. One of his colleagues even questioned Matt Cutts about it. Comstock reports that Cutts has since “insinuated” that Fishkin’s finding and their research are, in fact, true.
As a result, Comstock’s team developed a tool called First Link Checker. The tool spiders all outlinks on any page and then groups the outlinks that go with the same url to show the first one that Google sees in the source. Users can check their SEO efforts and determine if the link Google is counting is truly the one they intended.
To learn more about this tool, check out First Link Checker.

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I think this is very good information. Irregardless of which link gets picked up for SEO purposes, I still try to focus on providing the reader valuable content.