The number of users of Microsoftâ€™s Facebook Integration in Windows Phone 7 proven to be a pretty accurate measure of how many Windows Phone 7 users are out there, correctly predicting the number at around 5-6 million.
Now the latest data shows a sharply upward spike in the number of users, increasing from 1,000,000 Monthly Active Users on the 11th November to 1,100,000 on the 25/11/11.
If our previously calculated multiple holds true that would correspond to around 600,000 new Windows Phone 7 users, presumably buyers of the Nokia Lumia 800, and HTC Titan, Radar, Samsung Focus S and Focus Flash, although I suspect the massive Nokia push would have the lion share of the numbers.
Of course Android activates more than this in one day, but for Windows Phone it is a pretty big deal, and about 3 times faster than sales in the two weeks preceding.
Hopefully with further promotion the spike will turn into the norm, and we will see Windows Phone 7 continue to grow strongly.
Thanks Sem for the tip.