Now you can subscribe to updates for these types of objects:
user - receive notifications about specific fields and connections corresponding to user nodes in the Graph API. Permissions - Get notifications when your users change the permissions that they grant you Applications. Fields are similar to fields in the corresponding FQL table. page - receive notifications when the pages on which your application is installed changes its public properties. Please note that the page theme is used only to subscribe to changes to the pageโs public attributes (for example, title, category, image, etc.). This is the same information that is returned by calling the api chart https://graph.facebook.com/ . You can subscribe to the feed page in the same way as you subscribe to a user feed - the subscription topic must be โuserโ and the subscription field must be โfeedโ, Note. Not all properties and connections of a user object can be subscribed to.
Read this link https://developers.facebook.com/docs/reference/api/realtime/ for more information.
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