Techcrunch has just published a very interesting analysis of valuations of social networks. Here is its methodology:

Our model takes Comscore data for available countries and regions. We’ve graphed each of 26 well known social networks with the data we have been able to collect. We’ve then calculated the average advertising spend (estimated by PriceWaterhouseCoopers in a recent report ) for each person online in each of those countries. For example, in the U.S., the total 2008 estimated Internet advertising spend is $25.2 billion. We’ve divided that by the number of people online in the U.S. according to Comscore (191 million), to get an average Internet spend per person of $132.

I have charted the figures of interactive advertising spend per Internet user from this data below.

Source: Techcrunch, PricewaterhouseCoopers, Comscore

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