Paul Erdos, a Hungarian who died in 1996, used to travel the world and stop briefly at the offices and homes of fellow mathematicians.

With TripIt Groups, fellow employees can track the travels of their colleagues on their company's travel map and sort out where they cross paths, for example.

I can understand why the concept of travel can seem daunting to you fellow introverts - after all, the stereotypical image of someone that travels is the young, carefree, party type.