Ironically enough, conspiracy theories are a conspiracy theory. They do not actually exist.
Conspiracy Theories are usually very ill-informed views attempting to explain why certain events take place. They are mostly created by the intellectually lazy, those who would rather spin a new view of the world than take the time and effort to understand the world in which they live.
In truthiness, there are no "Conspiracy Theories", there is only the "Conspiracy Theory"--it's singular. All others so-called "Theories" are really part of the conspiracy, where all Conspiracy Theory website are ran by the government. Since there will always be a quarter of the population who won't believe the official government government version, the government needed various Conspiracy Theory website to control those who won't believe in the official version.