Objectivism
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Here I only list Objectivist resources not widely known, that I found helpful.
http://objectivistanswers.com/ -- this is a StackExchange-like forum for Objectivism questions
http://forum.objectivismonline.com/ - forum for Objectivism with long threads
http://www.peikoff.com/ - answers to common questions, also available as 300 iTunes podcasts, 20-min long each.
http://ronpisaturo.com/ - site of an Objectivist with articles I intend to read about math.
http://strongbrains.com/ - compiled by an Objectivist, a collection of reading suggestions for a well-rounded self-study.