What's the difference between party chat and deafen if I solo queue? Is it the same?
Update to the above:
/deafen will send a message to the rest of the lobby that you wont be participating in chat, and needs to be typed every game. It's good if you find yourself sucked into a flame war and need to re focus on the game.
party chat is a persistent setting that will remove you from the chat without letting other players know. Its perfect if you just want to play the game without worrying about chat.