I've been keeping an eye on the prices of the business social network LinkedIn and Pandora, the internet streaming radio service, and wondering whether history is repeating itself.

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One service of the PlayStation Network the company wants to promote is PlayStation Home, a social game network that has been relatively overlooked in the past.

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The service, Facebook Exchange, will let advertisers reach specific types of users on the social network based on their browsing history, Annie Ta, a company spokeswoman, said in an interview yesterday.

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Three possibilities proposed by Cox: a "peer-to-peer" social network, a cluster of "virtual individual servers" running on a cloud service such as Amazon Elastic Computer Cloud, and "hybrid decentralization, " a mix of the two approaches.

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The location based social network has been purchased by Facebook, and as part of the deal, the service will be switched off in January 2012.

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LinkedIn is proving one can make money charging for access to a social network, a testament to the career-building and sales-prospecting power of its service.

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