Netiquette

When you enter any new culture -- and cyberspace has its own culture -- you're liable to commit a few social blunders. You might offend people without meaning to. Or you might misunderstand what others say and take offense when it's not intended. To make matters worse, something about cyberspace makes it easy to forget that you're interacting with other real people -- not just ASCII characters on a screen, but live human characters.

http://www.albion.com/netiquette/index.html