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Couple of links on Roko's Basilisk, which is Forbidden Knowledge in LW:

An explanation: http://rationalwiki.org/wiki/Roko%27s_basilisk

Yudkowsky going gaga on reddit: http://www.reddit.com/r/LessWrong/comments/17y819/lw_uncenso...

> The fact that you disagree and think you understand the theory much better than I do and can confidently say the Babyfucker will not hurt any innocent bystanders, is not sufficient to exempt you from the polite requirement that potential information hazards shouldn't be posted without being wrapped up in warning envelopes that require a deliberate action to look through. Likewise, they shouldn't be referred-to if the reference is likely to cause some innocently curious bystander to look up the material without having seen any proper warning labels. Basically, the same obvious precautions you'd use if Lovecraft's Necronomicon was online and could be found using simple Google keywords - you wouldn't post anything which would cause anyone to enter those Google keywords, unless they'd been warned about the potential consequences. A comment containing such a reference would, of course, be deleted by moderators; people innocently reading a forum have a reasonable expectation that Googling a mysterious-sounding discussion will not suddenly expose them to an information hazard. You can act as if your personal confidence exempts you from this point of netiquette, and the moderator will continue not to live in your personal mental world and will go on deleting such comments.

Uh...