I quit having comments long ago because I barely have time to post (as the timestamp on my last few posts demonstrates) much less weed out spam and deal with trolls. But if I did have a comment policy, I’d steal this one:
Please use the comments to demonstrate your own ignorance, unfamiliarity with empirical data, ability to repeat discredited memes, and lack of respect for scientific knowledge. Also, be sure to create straw men and argue against things I have neither said nor even implied. Any irrelevancies you can mention will also be appreciated. Lastly, kindly forgo all civility in your discourse . . . you are, after all, anonymous.
Found at The Big Picture.
PS. You may also want to read Sean Carroll’s [non] comment policy for Cosmic Variance.