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Je Facebook nový Google hodný mnoho miliárd dolárov? Economist si to nemyslí. Tasty bits:

This analogy to address books points to an important limitation for social networks, such as Facebook, compared with older sorts of network, such as the postal or telephone systems. These benefit from Metcalfe's Law, which says that the value of a network is proportional to the square of the number of its users. In other words, the more people have phones, the more useful they become. This “network effect” leads to rapid adoption and puts up barriers for new entrants.
But unlike other networks, social networks lose value once they go beyond a certain size. “The value of a social network is defined not only by who's on it, but by who's excluded,” says Paul Saffo, a Silicon Valley forecaster. Despite their name, therefore, they do not benefit from the network effect. Already, social networks such as “aSmallWorld”, an exclusive site for the rich and famous, are proliferating. Such networks recognise that people want to hobnob with a chosen few, not to be spammed by random friend-requests.
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From an advertiser's point of view, says Rishad Tobaccowala, the boss of Denuo, the new-media unit of Publicis Groupe, an advertising company, Facebook is so far anything but the new Google. The search giant does have traditional network effects in its advertising system, he says: it aggregates advertisers and sends them to potential customers who have expressed specific intentions by typing search queries. But Facebook has only “large crowds who are communicating without expressing specific interests”, says Mr Tobaccowala. On Google, advertisements are valued; on Facebook they are an annoyance that users ignore.