I've updated the plugin to have support for our new Facebook Invite feature
It's a great new way to make your game more viral, and is really simple to implement...just create a new action with the event "Invite Facebook Friends". That will connect to the player's Facebook and bring up a modal window with their friends. They can select the friends they wish to invite, and a message will be posted on their Facebook wall about your game.
There's also an optional condition that will fire when at least one Facebook friend is successfully invited.
You can find the new version of the plugin here