I think the question is more which posts are good introductions and screens. So even if that is the best one to share on wikipediabook+ or whatever it is, others would also be worthy. The question is which ones are good enough, not which one is best.

Different posts would be appropriate for different places, simple ones linked to on facebook might be too accessible - I'm thinking of "Are Your Enemies Innately Evil." The last thing we need is for everyone on facebook to read that post one September 11th. "Mundane Magic" might be too complicated for many people on facebook, and serve as a good screen - I'm not really sure.

I agree that your choice is good and also suggest the following:

http://lesswrong.com/lw/uy/dark_side_epistemology/ http://lesswrong.com/lw/2as/diseased_thinking_dissolving_questions_about/ http://lesswrong.com/lw/j3/science_as_curiositystopper/ http://lesswrong.com/lw/h1/the_scales_of_justice_the_notebook_of_rationality/ http://lesswrong.com/lw/hu/the_third_alternative/ http://lesswrong.com/lw/gz/policy_debates_should_not_appear_onesided/