From Longman Dictionary of Contemporary Englishnetiquettenet‧i‧quette /ˈnetɪket/ noun [uncountable] informal the commonly accepted rules for polite behaviour when communicating with other people on the Internet
Examples from the Corpus
netiquette• You don't have to breach netiquette to get flamed-just expressing a contrary or naive opinion should do the trick.• Sending an angry e-mail in capital letters breaks the rules of netiquette.• When you are in love, perhaps netiquette does not count.From Longman Business Dictionarynetiquettenet‧i‧quette /ˈnetɪket/ noun [uncountable] informalCOMPUTING correct ways of behaving when communicating with people on the Internet, for example not being rude or using bad languageOrigin Netiquette (1900-2000) Net + etiquette 