Facebook comes up in blank lines
Go to Settings, select facebook, press uninstall or update, which option is available to you.
If uninstall, then the App will be uninstalled, after which you should re-install the app by going to App-Store and locate Facebook App there, to reinstall.
If Update, then you should select this option and lets the App update itself and try it Again. If problem still occurs, then uninstall as described above.
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