there is apparently a service dubbed Stalkbook developed by MIT graduate, Oliver Yeh, that lets you view that person's profile, photos, contact info, etc. simply by letting you view that profile under the guise of another Facebook user.
Key takeaway: "As our possessions become smarter and smarter, the question becomes less about if we can interact with these objects and more about how we want to interact with them. Touchscreens will simply be one of the many options-after all, swiping and tapping a flat, glassy screen isn't a blanket solution to make something interactive."