Kevin Maney writes: “You might already know what presence is. If you use something like AIM or Skype, it’s the ability to see that someone you know is also online. The next thing will let you also see where they are. Helio just came out with cellphones that can show where your buddies are on a map. The Wi-Fi network at the Massachusetts Institute of Technology has been set up so users can pinpoint their friends.”

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Rajesh Jain

An Entrepreneur based in Mumbai, India.