I suspect it comes as no surprise to any developer if I say that "Facebook":http://www.facebook.com has become extremely popular (not to mention extremely valuable!) over the last year. The feature on Facebook that has most intrigued me is the activity feed. For those that don't know, Facebook's feed shows you activity (any form of action taken really) of all your friends across various different functions in a single place. Or alternatively, it looks like this: Why can't you do something similar

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