Is this general behavior from every college or depends on case to case basis.
It probably depends on the school, though i do remember a few saying they didn't just send out contact info, period.
However, I did find that once I visited the school, it was easier to get in touch with students. Those folks who run the admissions desks are usually quite familiar with the various students and will always give you someone's contact info. And while I didn't try, perhaps alums as well.