The rules and etiquette of citizens on the net, i.e., 'netiquette'

Forum netiquette:-

The rules of etiquette followed in Internet Forums is called Forum netiquette. Forum netiquette can vary on different forums. On default, individuals must agree to a Registry Agreement that defines a forum's rules before joining that particular forum, but whether those rules are actively enforced varies from forum to forum. For example, a family friendly forum would prohibit sexually explicit content, but a sex-oriented forum would encourage it. Also, some forums are more tolerant of cursing and rude behavior than others.

Multiple posts:-

One common faux pas on internet forums is to post the same message twice. Users sometimes post versions of a message that are only slightly different, especially in forums where they aren't allowed to edit their earlier posts. Multiple posting instead of editing prior posts can artificially inflate a user's post count. Multiple posting can be unintentional; a user's browser might display an error message even though the post has been transmitted or a user of a slow forum might become impatient and repeatedly hit the submit button. Multiple posting can also be used as a method of trolling or spreading forum spam. A user may also send the same post to several forums, crossposting. This problem was inherited from Usenet and is a common complaint in many forums.

Spamming:-

Forum spamming is a breach of netiquette where users repeat the same word or phrase over and over, but differs from multiple posting in that spamming is usually a wilful act which sometimes has malicious intent. This is a common trolling technique. It can also be traditional spam, unpaid advertisements that are in breach of the forum's rules. Spammers utilize a number of illicit techniques to post their spam, including the use of botnets. Spamming is also considered a post that has little or no meaning to it at all (e.g., "I lik to tadada").

Trolls:-

A troll is a user that repeatedly and intentionally breaches netiquette, often posting derogatory or otherwise inflammatory messages about sensitive topics in an established online community to bait users into responding. They may also link to shock sites or plant images on networks that others may find disturbing in order to cause confrontation. Trolls known as gravediggers purposefully post in old and irrelevant threads simply to bring that thread to light again.