8) Engagement metrics like comments, favorites, views, can and should be used to drive discovery (the most interesting algorithm)I'd love to hear more about "discovery" as an engagement metric. Perhaps EricP can mull this one over a bit.
The other item on his list that is very intriguing to me is #10:
10) Machine tagging (autotagging) is the next big thing in web 2.0Machine tags sound like a very interesting next step in tagging, and a smart extension to the tagging process. More good consumer generated content that seems quite ripe for analytics tools to leverage to better understand visitors. Great stuff.
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