There are other articles talking about the same topic:
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http://www.nichepursuits.com/alright-google-you-win-ill-never-use-private-blog-networks-again/
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http://www.nohatdigital.com/blog/pbn-sites-de-indexed/
And there are a few threads discussing the same topic here. So if yiu want to learn more about it and read the opinions of different members as well as various speculations as to what might have aided Google in uncovering the private network sites and how they did it, you can search for the threads using the search button.
Glen also published a post which I suggest anyone interested in PBNs reads. He talks about why he'll keep growing his link network despite the crackdown.
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http://www.viperchill.com/private-link-network/
It's the best post I've read on the recent PBN deindexing.
