Danusha Goska's interesting "Biegański the Blog" about rabid anti-polonism in the USA and note this very succinct "notes for commenters" guideline which I thought was good:
Comments are moderated.
Your comment is more likely to be posted if:
Vignette: Cover of bookYour comment includes a real first and last name.
Your comment uses Standard English spelling, grammar, and punctuation.
Your comment uses I-statements rather than You-statements.
Your comment states a position based on facts, rather than on ad hominem material.
Your comment includes readily verifiable factual material, rather than speculation that veers wildly away from established facts.
T'he full meaning of your comment is clear to the comment moderator the first time he or she glances over it.
You comment is less likely to be posted if:
You do not include a first and last name.
Your comment is not in Standard English, with enough errors in spelling, punctuation and grammar to make the comment's meaning difficult to discern.
Your comment includes ad hominem statements, or You-statements.
You have previously posted, or attempted to post, in an inappropriate manner.
You keep repeating the same things over and over and over again.