What city is tops on Facebook?

At the end of June, the Toronto Star ran a story saying that Toronto had more Facebook members than any other city in the world. That was imprecise, as apparently what the writer had noticed was that the Toronto, ON network was the largest on Facebook, and then that turned out to be wrong, since the London (England) network is larger (891,623 at this instant). But, since Toronto had more people in its Facebook network per capita than London, this somehow got spun into Toronto having the most Facebook users per capita of any city on Earth.

Well, that doesn't seem to be true either. The Toronto, ON network at this moment has 728,476 members, which would be equal to 13.1% of the population of the GTA, using 2006 Census numbers. The Kitchener, ON network has 90,644 members, which is 19.0% of the population of Waterloo Region, again using 2006 Census statistics. So, Waterloo Region seems to blow the GTA away for Facebook users per capita.

Now, before the U of T statistics department goes and disavows all knowledge of me being one of their graduates, I should point out that we'd need more data about Facebook users and networks to be able to make any bold statements about who has the most users. Not that that's stopped people in Toronto from claiming to be #1. And there's no denying that Toronto's Facebook numbers are very impressive -- but it's not the biggest network and doesn't seem to be the largest per capita either.