According to one research firm, other blog popularity-ranking services are flawed because they only use one or two measurements to calculate the most popular blogs.

They, on the other hand, use a schmorgasboard of statistics including inbound links from the likes of Yahoo and Google, Alexa (does anyone normal actually use their toolbar?), plus US unique monthly visitor data.

Spotting a fundamental flaw in this already?

Or, in other words, how many of those blogs are not US-based?