First off I love this site, wow what a great idea!
I think a solution to the concern is to allow employers to mark harmful information and for that information to be removed. I know that then the employers could attempt to remove bad reviews, but this is where you'd need human interaction at some level.
Give employers 5 strikes, if they attempt to take down something defaming just because it's a bad review that's a strike. If they get to 5 they can't make a request for a set time frame (to keep the amount of human intervention to a minimum). The reverse could be true of your anonymous users. The 5 strikes is arbitrary.
I think a solution to the concern is to allow employers to mark harmful information and for that information to be removed. I know that then the employers could attempt to remove bad reviews, but this is where you'd need human interaction at some level.
Give employers 5 strikes, if they attempt to take down something defaming just because it's a bad review that's a strike. If they get to 5 they can't make a request for a set time frame (to keep the amount of human intervention to a minimum). The reverse could be true of your anonymous users. The 5 strikes is arbitrary.