I'm questioning my friend if she actually cares about what she shares on fb
What does she share on FB that makes you concerned?
She told me that her Fiance left at the airport, but I've spotted him on facebook..
While it is valid to wonder if what people say to you then present on social media are the same, you probably shouldn't put too much thought into your friend's status. Many people don't post their real locations on social media for safety. Maybe you should stop worrying about what is happening on facebook and try talking to your friend.
I thought what she shared was true.
You can't be on the airport while on Facebook? I can be in a bathroom while on Facebook.