Dota 2 Wiki:Commandments

A game of Dota 2 is a long, enduring, co-operative experience; which often provides great action, emotions, turn-arounds, and is never completely over until the ancient drops. Unfortunately, some games of Dota 2 also become a test of thick-skin, when a team cannot hold their own in a match; Dota 2 Wiki’s commandments of friendly play are simple behaviours you can employ that will generally improve the friendliness and fun you’ll experience in games, even if you’re losing.

Win a Steam code for Dota 2
To help spread the word of these commandments, the Wiki has 20 Steam-redeemable codes for Dota 2 that will be given away for people to get into the game themselves, or for existing players to share with friends. To have a chance at winning a key, simply tweet the message below; At 12:00 PST on Friday the 19th of October, 2012, 20 randomly-selected twits will receive a direct-message with the code; you’ll have to follow @Dota2Wiki for us to be able to Direct Message you. I pledge allegiance to @Dota2Wiki’s Commandments of Friendly Play. http://www.dota2wiki.com/wiki/Project:Commandments #d2wfriendlyplay.
 * This giveaway has now concluded; winners have been sent their codes.

Commandments

 * 1) Commend fun teammates, or generally friendly people; let the game know they’re good guys.
 * 2) Report any problematic players, to help the game stomp out bad behaviour.
 * 3) Praise players regularly, and on noticeably favourable situations.
 * 4) Console bad outcomes to maintain moral. “Good try, unlucky though”, “Good attempt, let’s reset”.
 * 5) Be courteous. Games are long and require focus, however interruptions can occur for a variety of reasons; if a player has paused then they deem their interruption important enough to warrant the pause - be courteous and allow that player their pause.
 * 6) Never pass blame.  Dota 2 is a team game, as such negative outcomes must be endured as a team - singling out a player and dumping all the responsibility on that player only weighs them down and decreases the team’s moral.
 * 7) Never give up.  If your ancient is alive, you have a chance - Dota 2 is won by capitalising on opponents mistakes, always have your eyes open to catch those mistakes.
 * 8) Never trash-talk your opponents.  It's not friendly.
 * 9) End it.  Losing is generally not a pleasant experience; if you know you can win a game then do so - end the opponent's misery.