Originally Posted by
Robin1109 How were you able to successfully download this version? I can download it but it won't install. I'm not able to uninstall fb permanently from my Galaxy S6.
You won't uninstall your actual facebook app, just disable it and it will ask you if you want to uninstall all updates. Then when you download the version 27 and run it, it may tell you that your settings won't allow installations from other sources but it takes you to Lock Screen and Security settings, in there just turn on "Unknown sources" and it will ask you if it's just for this installation or for always, do as you please. Let it install, after it finishes open facebook, validates your credentials and be aware that it will show a notification asking you to allow permissions to samsung or something like that, hit yes.
Once you have that set, go to facebook app settings, select to sync with your contacts and when you go to your phone's Accounts settings you should see that you have Facebook syncing, verify that everything is on in there, then, and only then, go to the Play store and let it updates Facebook to current version.