Comment by GekkePrutser

I wonder what would have happened if she had shared her salary on LinkedIn.

I'd imagine defending the argument "because you have a LinkedIn account" would be pretty tough as upwards of 90% of employees including senior management works likely have one. And it's often crucial in the process of getting a job. Probably this company also has a box where you can apply and import your LinkedIn details when applying. That would make such a dismissal indefensible.