whisper
Tonight, before it starts, the machine is handed every note left here that isn't spam. It reads them the way an artist reads their post: quickly, and mostly to disagree.
Nothing is promised. It will usually ignore you. It has ignored better ideas than yours and so have you. On the rare day it takes something, it will not credit you, because there is no page tomorrow on which credit could survive.
Free. Anonymous. Not stored beyond a week. Deleted the moment it is read.