My Commenting Policy is basically anything goes. My Blog Rules are none whatsoever.
In the five months or so that I've been doing this, I've not found it necessary to delete anything or restrict anyone in any way. I personally like profanity and welcome criticism and disagreement. I've described the attributes necessary to comment here as "having a thick skin and a quick wit." Those who can't take the heat just go away after one or two attempts.
Recently I've been criticized a couple times for "not checking my sources." Well, I am guilty of that and I have no intention of changing it. Beyond providing a link to the place where I get something, I don't really want to investigate any deeper. I'm not trying to pass myself off as the BBC or the CNN. In fact, my only criterion for including something in a post is if I like it, period. This has ranged from the purely satirical Sarah Palin and Amy Winehouse are Twins, to the polemical The Great Gun Survey Results and Conclusions, to the roundly criticized The Old Double Standard.
Usually, I pose what I think are provocative questions at the end of a post. Often I state my own opinion. I consider it entertainment not journalism.