Linked-in inmaps seems to accurately cluster the people you are connected to:
Hit the link and login with your Linked In account and it will churn away, producing the pretty diagram. The fun is in mousing over the dots, especially the ones on the edges and between the clusters.
But while it’s fun, it’s not really useful. Moreover I’m still short the stock of Linked In itself, which I believe is wildly overvalued.
Lance Wiggs 
This is kind of fascinating. My map is of much more connected (mainly nz based) networks.
In the above image you can see your links over laid on top of my networks…. it strikes me that this is useful.
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Is There a Bubble in LinkedIn’s Stock Price?
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