What creeps me out is that there are now salary databases that people can use to see someone's prior salary history, job titles, and (in some cases) details of separation. It shouldn't be legal for those to exist, nor for companies to use them.
I actually checked myself in one ("The Work Number") in 2012 and it had an accurate title and salary history, which I hadn't made public. Scary, creepy stuff going on. How the fuck are they able to know that?