Earlier quoted context omitted.
Here it is: http://news.netcraft.com/archives/2011/07/08/july-2011-web-s...
Thanks David, but I actually still don't see it on there. No biggie; it's just such an impressive stat that I want to see it with my own eyes :)
We're using the total published sites on the Weebly platform divided by that number to get our percentage of the total.
We could probably use active sites and put up a higher percentage, although that number is much harder to calculate...