Post Info Items and new plugins

I wanted to add some new options to the Post Info Items. An example would be this Share This

I have figured this much out
1. bfa_postinfo.php is where the code for the plugin and the %example% are coded. I noticed that is not the normal <php> that must plugins in use. I tried to code a plugin and failed
2. bfa_theme_options.php is where the description is held.

Any help would be greatly appreciated and when I finish the hacks I will post the code so you can expand your list of integrated plugins.