Fabio,
We have integration for Alpha User Points built-in to JFBConnect which can award for the following activities by the user:
* Clicking the Like button for any of your content. They can be rewarded for each article they like, or just for the first one they like.
* Commenting on any of your content. Again, this can be for the first comment or for each article they comment on.
* Sending Facebook invitations to their friends. For this, I believe, they can be rewarded for each friend sent to. It may just be for sending a request (even if it goes to multiple people). I can look into that more if you'd like more information.
I hope that helps, but if you have any questions, let me know.
Thanks,
Alex