I have a document in Writerie which is called The Void - every time (at least most of the time) I am angry about something or want to complain and would normally tweet it out, I instead write it down in The Void.
This way it is out of the way, and at the same time I don't tweet something stupid I may regret later. Getting it out of my head is very important for me. If I don't write it down, I will think about it again and again and get mad.
The Void helps me here and frees my thoughts.