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Cornell's VPN service is designed to facilitate access to Cornell-based resources. It is not a generic VPN service. Specifically, Cornell's VPN is a "split horizon" service so if you are off-campus and are accessing a Cornell resource, the VPN is invoked. But But if you are using an off-campus service (Facebook, Box.net, Google, etc.), it does not go through Cornell's VPN:
http://www.it.cornell.edu/services/vpn/faq.cfm#outside_computers
Thus if you are in another country (thus, you are off campus), and you are trying to reach a non-Cornell resource in another country, Cornell's VPN service will not help you do this.
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