I see a new revenue stream for Facebook here — some kind of automated friend-portfolio management app that optimizes your mix of friends and alerts you whenever a buddy spends too much time in a bad neighborhood or starts hanging out with low-lifes. Maybe Facebook could even set up an exchange for trading friend-portfolio derivatives. You could have everything from Aaa-rated friend portfolios (stable marriages, high-net-worth zip codes, regular statin intake) to speculative junk-rated friend portfolios (druggies, socialists, poets).

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