First, I'd like to say that I've been using this plugin for a long time and I love it. Thanks!
I have found one bug though that I'd like to bring to your attention.
The Facebook share button disappears with "PBD AJAX Load Posts" plugin when you load new posts.
Here's how to reproduce it.
1. Go to http://www.gospelebooks.net
2. Scroll down to the bottom and click "Load more deals"
3. All new deals that load will be missing the Facebook SHARE button.