I installed WordTwit Pro in a WordPress installation that contains Wordbooker as well. Each time since I installed WordTwit Pro I get multiple posts to the pages. I am not sure why this happens as I have checked to see if there is any interaction between WordTwit and Facebook.
The WordTwit people told me that under the hood, WordTwit Pro adds a custom post with "ok" in the body. That custom post is set to be private so other plugins shouldn't be doing anything with it.
They advised me to disable posting for custom post types. Can I do this with WordBooker. If not, they suggested I may need to contact you to see if you can change WordBooker not to post private post data to Facebook.
I hope that makes sense as this is what they have advised.