video chat doesn't work anymore, different state??

So, I just bought my mac in July to use in college. While I was at home, I used video chat a few times and it worked just fine. However, as soon as I tried to use it at college, it never worked. I was wondering if the problem could be because I'm in a different state?? I live in Michigan and am going to school in Florida. My other friend from Michigan is going to school down here as well and she is having the same problems. Does anyone know if this can be fixed somehow?? Any help at all would be appreciated, I'm dying to talk to my friends!!

Thank you!!