Estimation of IPv6 brokenness

Eric Vyncke has been gathering live data for the estimation of  IPv6 broknenness  (http://vyncke.org/testv6/) since Oct 2010. As of today, his estimation derived from the gathered data reveals that there might be up to 0.7 % IPv6 brokenness. However, Yahoo estimates that the number of users affected by broken IPv6 is about 0.05 % of global Internet population (2 billion at present) or equal to 1  million. Yahoo's estimation is just  1/14 of Eric Vyncke's test data.



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Which one should I believe more, why and how ???

If it turns out that IPv6 brokenness can be up to 0.7 %, then there is no chance Facebook, Yahoo and Google will activate their content on IPv6.

Anyway, the IPv6 World Day 24-hour test flight might provide some useful clues. I am eager to hear the announcement of  Facebook, Google and Yahoo after they have analyzed their  captured data on IPv6 World Day.