I like to post on facebook

Are you saying that when someone like's an article from your site.. if someone else clicks the "Like" in the wall post that is created, that it will count for the article on your site?

If so, unfortunately, that's not how it works. Because the like box can have a comment on the article, or other user entered information, the Like on the wall post is for the Facebook user's comment, not for your site. It still will post that comment to their wall, for their friends to see, with a link to your article, but doesn't add to the article's Like count.

Hope that helps explain. That is Facebook's design, and there's no way we can change that.

There's no way to know who Like's a page by asking Facebook. With our email notification, we have a task to add the user's Joomla username to the email, if they're logged into your site. Beyond that, I don't think Facebook will let us get information about the user without specifically getting their permission.

Facebook really tries to stop any type of promotions/rewards for clicking the Like button. They want all clicks to be valid, honest clicks, so they don't make it easy to determine who has clicked the button or when.

Hope that helps explain!