Now you can poke, tag, bite or write on your friend’s wall or look up profile information, all via SMS. All you need to do is activate Facebook Mobile on your Facebook account. We’ll text a confirmation code to your phone.
You can also receive Facebook messages, Wall posts, and notifications as text messages to your mobile.

* The notifications sent by fb  is free of charge. However standard SMS apply when you update your Facebook information via SMS.

Read more : visit http://www.dialog.lk/en/mobile/services/fbmobile/index.html