Installing the Facebook Social Addons Collection makes the Facebook Like addon available for you to add to any page or any addon.
It automatically adds the Open Graph Collection as well. You must go to the admin site and setup Open Graph Settings, available from the admin site under Settings.
To learn more about how Open Graph is integrated into Facebook, click here.
To add Facebook Like to an Addon
The Facebook addon determines the correct URL for the Like settings by reading the document property "Open Graph URL". Since open graph is automatically installed with Facebook, this URL will be set to the current page's Link.
If you are embedding Facebook into an addon like the Blog, simply embed the Facebook Like addon after setting the document property for the article URL. It will use that Link and produce the correct Link