Who made them the authority on fact vs fake?

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I slways heard it is a George Soros Owned site in some round the sewer way, so I don't give it credence for much of anything except leftist pucky.

Example: Why I give snopes zero credibility.

<broken link removed>

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A cursory internet search shows that the link you provided is itself 'pucky':

Analysis: False. The older of the two messages above is a viral version of an article that appeared on the political news and opinion website WorldNetDaily.com on August 4, 2010.
As you can see by viewing the "Editor's Note" that replaced the article a few days later, WND admitted that the court cases in question were incorrectly described as pertaining to Obama's Constitutional eligibility

from http://urbanlegends.about.com/od/barackobama/a/Obama-Kagan-Connection.htm