A long time ago, when people dialed (as in telephones) into Unix machines in some closet or college campus, they used a command called "
w" to see who was also on the machine.
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Source: http://feeds.gawker.com/~r/gizmodo/full/~3/RG3vx0ywZGU/the-simple-unix-command-that-gave-birth-to-social-networking
James Christopher McMurray Hans Herrmann
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