THE NET DIFFERS from most of the mass media it replaces in an obvious and very important way: it’s bidirectional. We can send messages through the network as well as receive them. That’s made the system all the more useful. The ability to exchange information online, to upload as well as download, has turned the Net into a thoroughfare for business and commerce. With a few clicks, people can search virtual catalogues, place orders, track shipments, and update information in corporate databases. But the Net doesn’t just connect us with businesses; it connects us with one another. It’s a
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