Hello! My name isXXXXX will work diligently to provide accurate advice and information.
First, let’s attempt resolving this issue with your Apple device by trying a hard reset, then proceed from there if that does not resolve the problem:
Disconnect the device from it's cord, if plugged in.
Press and hold your Sleep/Wake button (on the top) and Home button (on the front) together for around 10 seconds.
When the Apple logo appears, release both buttons.
The next thing you should see are the Apple logo followed by the home screen a few minutes later.
Now, try Facebook. If Facebook is still not working, are you able to access the page via Safari?If you still have concerns, please do not negatively rate my answer, simply reply back before rating. I'll be more than happy to work with you further
. Hopefully, this info will answer your question. When you are satisfied, please give my answers a positive rating. You are judging my personal service only (not this website or your issue) and high ratings assure I remain in good standing.
Thanks and good luck,