Interesting piece on the value of social networks… The Economist, in short, says…

So it is entirely conceivable that social networking, like web-mail, will never make oodles of money. That, however, in no way detracts from its enormous utility. Social networking has made explicit the connections between people, so that a thriving ecosystem of small programs can exploit this “social graph” to enable friends to interact via games, greetings, video clips and so on…

… The problem with today’s social networks is that they are often closed to the outside web. The big networks have decided to be “open” toward independent programmers, to encourage them to write fun new software for them. But they are reluctant to become equally open towards their users, because the networks’ lofty valuations depend on maximising their page views—so they maintain a tight grip on their users’ information, to ensure that they keep coming back. As a result, avid internet users often maintain separate accounts on several social networks, instant-messaging services, photo-sharing and blogging sites, and usually cannot even send simple messages from one to the other. They must invite the same friends to each service separately. It is a drag.

Online social networks | Everywhere and nowhere | Economist.com