The company I work for hangs a list of interviewees on the board so comment can be made to the relevant CP/TM or whoever.
People get asked about subjects which otherwize wouldn't be brought up and given the chance to explain themselves fully.
"Do you still owe such and such for your bond?"
"Was it you who did something or other?"
My former employer knew about my success with my current employer within 4 days; before I did in fact.
I think its a great way to vett applicants.