Great for chain letters and virus alerts, but there are probably better places to find out the truth behind the latest political outrage circulating among your friends.
EDIT: Why was the question worthy of a down vote?
But why is that relevant? I (and assume most people) are capable of assuming different modes of writing, including modes devoid of opinion; or with opinion carefully noted as such.
People who feel strongly enough about something to write legitimately leaning fluff pieces are not the personality type that I expect to be able to assume writing modes devoid of opinion, personally. I know very few people who aren't considered moderate/independent who I believe could pull that off.
These are the same people who've been proven to disbelieve factual information when it contradicts their world view.
http://www.npr.org/templates/story/story.php?storyId=1284908...
That is the type of person that I would not trust in a "fact checker" position, especially one in which their version of events will be cited by others as "fact".