Will be interesting to see how this plays out. Obviously we're now in a time where you can be fired for stuff on your social media feed, but some of those are going to go over better in the court of public opinion than others.
If I had to guess, I'd say maybe her profile said she worked for Delta, and/or had pics of herself in company accoutrements on her feed, that kind of thing.
And yeah, it would be interesting to see what the feed of the person who turned her in looks like. But they may not have a FB profile, preferring to stick to truthier alternatives...
I think it's time for these people who are fired for actions outside of their job, during their personal off time, that has no connection to their job other than they are employed by them.. (IE companies who believe they have the right to dictate their employees private lives, personal social media).. to file for unpaid, back wages. If these companies believe they have the right to dictate your freedoms, your private lives, and in some cases, your beliefs (religious, political, etc). outside the workplace, then as far as I am concerned, they are still on company time which should require them to compensate them for all hours of the day as they are still "on the clock" and being controlled by their employer, even during their off personal time. This also should happen even if they are on Salary, as that salary does not cover personal time off.
Short version: If they want to control their employees actions 24/7, then they need to pay them an hourly wage 24/7. (NO less than the minimum wage).