A study of Microsoft's instant messaging network supports the popular idea that everyone on the planet can be connected through fewer than seven links in a chain of contacts.
The study's findings have some remarkable implications. For instance, Bill Gates is only 6 or 7 degrees away from free software advocate and Microsoft critic Richard Stallman, and John McCain -- though miles apart in age and political beliefs -- is no more than just a handful of social connections away from his presidential rival, Barack Obama.
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