Google Play email address - double check that you joined this Google Group with the email address associated with your Play Store account. To see which email address to use, open the Play Store app and tap Menu > Accounts.
Error Message - if you see an error on step 2, it means you either haven't not joined this Google Group (step 1) or you joined the Google Group with a different email address than your device users to connect to the Play Store (bullet above).
Restart your phone - if the update is still not available after trying the steps above, you may need to restart your phone.
Uninstalling the app - to uninstall Facebook in step 3, go to your phone's settings, then Applications > Manage applications > Facebook > Uninstall or uninstall updates. Some people may asked to replace the app with the factory version of Facebook. Choose OK and continue to step 4.
Google Play Help Center - if you completed the steps but the app still isn't downloading successfully, learn how to troubleshoot issues in the Google Play Help Center: http://bit.ly/g19nxjks
Push the app to your device - after completing step 2, visit this link [http://bit.ly/121po71] and click Download Facebook from the Play Store at the bottom. Some people may be asked how to complete the action, select Internet or your browser. Then, click Installed, Install or Update > select your device > click Install.