Perri,
You said:
When graduating we are not to exchange residing information.
Why do you think they have that policy? It's pretty standard for the industry, btw.
Here you've spent an average of 2 years with a group of peers, doing all the 'emotional growth' work, divulging your deepest secrets and pain, apparently building close relationships, and you're not allowed to get their contact information when you leave. That has never made sense to me.