In my opinion, there are two killer apps on the web: email and forums. I know at least for me, my email history is my most accurate social graph. Cell phone history gives my trusted social graph. -- KM


Recent BITS column in NY Times on making your email history a lens on your social network. Both Yahoo and GMail have plenty of data. Microsoft does not have the data, but a big opportunity when you consider all of the email history data ...

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