Such sources are highly prone to distortion of facts, rumor propagation and incorrect reportage; yet are increasingly mixed into the source pool of major news organizations.
Incorrect information as well as intentional misdirection becomes part of the story and is difficult to remove from the public consciousness.
Blog Fog can be used to create doubt about the facts of any story simply by posting contradictory information. Then the very existence of contradictory information can be cited as proof that there is no right or wrong answer, that "both sides" could be right, and so a fog is created.
Blog Fog is similar to the "fog of war" in concept.