1. the full reconnect procedure again detailed at http://en.support.wordpress.com/publicize/#reconnecting-facebook including step 3 (removing the FB app), which is probably the most important step.
2. publicize troubleshooting http://en.support.wordpress.com/publicize/#troubleshooting
3. If neither of those work for you then RSS Grafitti http://www.facebook.com/RSS.Graffiti can be used. RSS Graffiti periodically checks the RSS/Atom feeds that you specify and posts any new entries it finds to the Facebook Walls that you specify. You can get any feed written on any wall (Facebook Profiles, Fan Pages, Groups, Events and Application Profile Pages). In fact, multiple feeds to multiple walls. You choose the combination.
4. That being said, the most effective way to promote your posts via social media and social networks is to post unique snippets and links manually to each site. We are drowning in an ocean of duplicated auto-posted snippets and links and by joining social networks we are, in essence, agreeing to be spammed by a select group pf "friends". Well, these days people are becoming downright snarly about receiving identical impersonal robo-posted snippets and links posted across multiple social networks.