Netiquette, a colloquial portmanteau of network etiquette or Internet etiquette, is a set of social conventions that facilitate interaction over networks, ranging from Usenet and mailing lists to blogs and forums.
Like the network itself, these developing norms remain in a state of flux and vary from community to community. The points most strongly emphasized about Usenet netiquette often include using simple electronic signatures, and avoiding multiposting, cross-posting, off-topic posting, hijacking a discussion thread, and other techniques used to minimize the effort required to read a post or a thread. Similarly, some Usenet guidelines call for use of unabbreviated English while users of instant messaging protocols like SMS occasionally encourage just the opposite, bolstering use of SMS language. However, many online communities frown upon this practice.
Common rules for e-mail and Usenet such as avoiding flamewars and spam are constant across most mediums and communities. Another rule is to avoid typing in all caps or grossly enlarging script for emphasis, which is considered to be the equivalent of shouting or yelling. Other commonly shared points, such as remembering that one's posts are (or can easily be made) public, are generally intuitively understood by publishers of Web pages and posters to Usenet, although this rule is somewhat flexible depending on the environment. On more private protocols, however, such as e-mail and SMS, some users take the privacy of their posts for granted. One-on-one communications, such as private messages on chat forums and direct SMS, may be considered more private than other such protocols, but infamous breaches surround even these relatively private media. For example, Paris Hilton's Sidekick PDA was cracked in 2005, resulting in the publication of her private photos, SMS history, address book, etc.
A group e-mail sent by Cerner CEO Neal Patterson to managers of a facility in Kansas City concerning "Cerner's declining work ethic" read, in part, "The parking lot is sparsely used at 8 A.M.; likewise at 5 P.M. As managers—you either do not know what your EMPLOYEES are doing, or YOU do not CARE ... In either case, you have a problem and you will fix it or I will replace you." After the e-mail was forwarded to hundreds of other employees, it quickly leaked to the public. On the day that the e-mail was posted to Yahoo!, Cerner's stock price fell by over 22% from a high market capitalization of US$1.5 billion.