Implementing a “Like” button on WordPress posts (just as Facebook does) simply requires the use of AJAX combined with WordPress custom fields. As you will see, this is not a complicated task.
You can get a Facebook’s page feed simply by running a direct GET request to https://www.facebook.com/feeds/page.php?id=your-page-id&format=format. You only need to specify your Facebook’s page ID (a numeric value) and the desired return format. In our example we’re going to use JSON as the default format. Since jQuery cannot directly access the remote feed, we also need to create a PHP proxy script that will actually perform the request.