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New Economist Article on Facebook IPO
http://www.economist.com/blogs/schumpeter/2012/05/facebooks-flotation-0

It talks about the GM problem. It also links to this interesting infographic:

http://www.wordstream.com/articles/facebook-vs-google-display-network

The infographic is hard to read, but it contains a lot of interesting
information if you put the puzzle pieces together.

Cheers,
Rob