Etiquette forms the basis of conduct which is strongly recommended in a social circle or community, and often required by others in more official circles. These formal rules develop in many social arenas. Etiquette is like a code for behaviour that can be observed by others.
Etiquette is about communicating in such a manner as to give a good impression to other members of the community. It can be used to advocate a preferred opinion by attempting to create a perceived identity which is favoured.
In the computer world this is often referred to as netiquette (internet etiquette). Netiquette is an informal guide for using browsing and other online activies.
This is a list of wiki topics dealing with online etiquette in several media.
TakeDown.NET -> “Etiquette”