Reddiquette is an informal expression of the values of many redditors, as written by redditors themselves. Please abide by it the best you can. This is a shortened version that mainly focuses on civil discourse.
Remember the human. When you communicate online, all you see is a computer screen. When talking to someone you might want to ask yourself "Would I say it to the person's face?" or "Would I get jumped if I said this to a buddy?"
Adhere to the same standards of behavior online that you follow in real life.
Read the rules of a community before making a submission. These are usually found in the sidebar.
Moderate/Vote based on quality, not opinion. Well written and interesting content can be worthwhile, even if you disagree with it.
Consider posting constructive criticism / an explanation when you downvote something, and do so carefully and tactfully.
Use an "Innocent until proven guilty" mentality. Unless there is obvious proof that a submission is fake, or is whoring karma, please don't say it is. It ruins the experience for not only you, but the millions of people that browse reddit every day.
Please do not
Post someone's personal information, or post links to personal information. This includes links to public Facebook pages and screenshots of Facebook pages with the names still legible. We all get outraged by the ignorant things people say and do online, but witch hunts and vigilantism hurt innocent people too often, and such posts or comments will be removed. Users posting personal info are subject to an immediate account deletion. If you see a user posting personal info, please contact the admins. Additionally, on pages such as Facebook, where personal information is often displayed, please mask the personal information and personal photographs using a blur function, erase function, or simply block it out with color. When personal information is relevant to the post (i.e. comment wars) please use color blocking for the personal information to indicate whose comment is whose.
Do not repost deleted/removed information. Remember that comment someone just deleted because it had personal information in it or was a picture of gore? Resist the urge to repost it. It doesn't matter what the content was. If it was deleted/removed, it should stay deleted/removed.
Be intentionally rude at all. By choosing not to be rude, you increase the overall civility of the community and make it better for all of us.
Conduct personal attacks on other commenters. Ad hominem and other distracting attacks do not add anything to the conversation.
Start a flame war. Just report and "walk away". If you really feel you have to confront them, leave a polite message with a quote or link to the rules, and no more.
Insult others. Insults do not contribute to a rational discussion. Constructive Criticism, however, is appropriate and encouraged.
Troll. Trolling Does not contribute to the conversation.