My facebook does not work since updating to IOS 7.1 what to do

Hey Elaine1957!

Here is an article that can help you troubleshoot this issue with your purchased app:

iOS: An app you installed unexpectedly quits, stops responding, or won’t open

http://support.apple.com/kb/ts1702

Thanks for using the Apple Support Communities. Have a good one!

-Braden

You're welcome, Elaine1957! Thanks for being a part of the Apple Support Communities!

Regards,

Braden