After a number of mergers and acquisitions five powerful media conglomerates lead the world's content production and distribution. They operate on an international basis with subsidiaries all around the globe and engage in every imaginable kind of media industry.
Table: The World's Leading Media Companies
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(* Revenues of Time Warner only (merger with AOL took place in January 2000)
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This book gives a fascinating glimpse of the many documented attempts throughout history to develop effective means for long distance communications. Large-scale communication networks are not a twentieth-century phenomenon. The oldest attempts date back to millennia before Christ and include ingenious uses of homing pigeons, mirrors, flags, torches, and beacons. The first true nationwide data networks, however, were being built almost two hundred years ago. At the turn of the 18th century, well before the electromagnetic telegraph was invented, many countries in Europe already had fully operational data communications systems with altogether close to one thousand network stations. The book shows how the so-called information revolution started in 1794, with the design and construction of the first true telegraph network in France, Chappe's fixed optical network.
http://www.it.kth.se/docs/early_net/