If you’re an App.net Developer, you can post to App.net directly from Editorial. I integrated this workflow into Federico Viticci's Post to WordPress workflow, to post new articles to App.net in addition to Twitter. If you have a developer account, follow the steps below:

  1. Go to account.app.net/developers/apps
  2. Select 'Create an App'
  3. App name, website, callback can be any values
  4. When the app has been created, go to App Settings, and 'Generate a user token for yourself'
  5. Enter the user token as directed in the workflow.

Download the workflow here