The general policy followed on this blog is Wheaton’s Law - please, don’t be a dick.
I also don’t generally approve comments that are giving links to advertisements or paid sites, unless they come with a really good explanation for why the author is submitting them (namely, if they are salient to the discussion at hand and there is a decent chance that some/many of the readers here would have access anyways, for example with some paid newspaper sites). No offense to anyone attempting to advertise through the internet, but it’s too difficult to draw a more precise line between honest advertising and spam.
I am aware that much of the material I cover on this blog can be considered controversial, and I don’t always give citations, mostly for the sake of readability, and so I welcome comments and criticisms, and will not generally ban comments for being critical. However, if you do feel the need to troll, please remember that while you are entitled to your opinion, I’m not actually required to listen to your opinion. I won’t allow flame wars on my blog, mostly because I don’t care about your opinions that much.
To everyone else, please remember that the first rule of the internets is DO NOT FEED THE TROLLS.
 I suppose I support the Wheaton Corollary, as well, although I can’t imagine how it would ever come up . . .