Facebook Timeline is still on developers test so ordinary user can't preview this until it is open to public. You need to be a developer and create an App in order to take this effect however, if your account isn't authenticated, you can't create one. So follow the steps below to authenticate your facebook account.
1. Login to your Facebook Account.
2. Go to Account Settings
3. Click Mobile then follow the steps provided. (Countries may vary..)
4. You will then received a confirmation code on your mobile phone that you will going to input.
5. Once done, viola! Your account is authenticated.
