Add-on that allows marking a specific user and hide his post from the view for other users but not for him. The silenced users isn't aware that he is silenced, but other users are free from him annoying them. Only posts posted after silence has been enabled are affected. Lifting the silence ban doesn't show those post ever again - this actually should be a flag added to posts not to the user. The intention of this plugin is to discourage users from participating in the discussion without an outright ban.