What rule or rules would you add to the ten commandments of web etiquette?

They're semi-famous now, but it was actually a friend of mine who originally wrote them. They're a list of ten rules of thumb to go by when using the internet. They imply things like the potential drawbacks of assuming someone's other identities, how to caution against archive forgery, when the best time is to complain about mods, etc. and serve as a go-to for advice on interpersonal relations when indirect contact is at play. Written in the style of a Greek philosopher, they were written in a setting where people were committing massive collateral damage with their animosity/gullibility/skepticism and they have paved a better modus operandi than many contemporaries can. Confidently asserted but open to at least some change, what would you add?