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Wikipedia defines a "natural monopoly" as "a monopoly in an industry in which high infrastructural costs and other barriers to entry relative to the size of the market give the largest supplier in an industry, often the first supplier in a market, an overwhelming advantage over potential competitors."

That's the case for Facebook. The barrier to entry isn't the cost of the machines or software, but the Network Effect: if your friends aren't on the new network there's little reason for you to go there. Once large network is more effective than many small ones. Facebook could give up that natural monopoly, if they chose to, but they won't unless forced.

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