Sometimes, autoposting to Facebook may suddenly fail. This usually happens if you have changed your password on Facebook. When you change your password, Facebook severs all existing connections with external sites, so you need to re-add them.

This usually takes care of most Facebook autopost issues:

1. On Posterous, delete your Facebook autopost site by going to Space Settings, clicking the “Autopost” tab, then deleting Facebook.

2. Visit http://www.facebook.com/editapps.php

3. If you don’t see Posterous in the list, click “Authorized” in the dropdown, and see if it’s in the list there.

4. Click the blue “X” to delete the link to Posterous.

5.Log out of Facebook

6. Clear your cookies and cache

7. Start again by adding Facebook profile as an autopost site on Posterous