Manually implemented something like this in my fbook account, but it was a major pain to do and doesn't provide all of the proposed functionality/openness. It

Manually implemented something like this in my fbook account, but it was a major pain to do and doesn't provide all of the proposed functionality/openness. It would ruin much of their "walled-garden" strategy to let this work with other services. What they believe is their strength, will become their weakness.