Stay on-topic: stick to the subject of the blog you are commenting on. Off-topic comments (even if reasonable, polite and interesting) will be removed. Comments which contain links to inappropriate, irrelevant or commercial sites may also be deleted.
Advance the discussion: provide links to useful resources. It can be difficult for readers to sift out good sources, so we ask that you do your best to provide a link to a relevant source to back up statements or arguments you’re making. Not doing this might mean your comment gets edited or deleted.
Keep it focused: There’s a maximum length of 400 words per comment. Beyond that the comment system will truncate you!
Be polite: comments which contain swearing or which abuse other participants in the debate will be deleted. Particularly:
No ad hominem attacks: vigorous debate is fine, but not personal attacks or accusations.