[txhurl]

I always wonder how many liberals come here for real info and how that affects alexa.

[CutePuppy]

Alexa is worse than useless for site popularity, it relies on installed Alexa toolbar in IE browsers and is often considered malware / spyware by antivirus applications, so is likely to be removed. Any data from Alexa is severely distorted from the get-go.

This data was taken from Hitwise, not Alexa. Hitwise is substantially better than Alexa, but still not a reliable source of unique (or aggregate) site visitation stats, but it is using a comparative technology so it can be somewhat useful.

SEOmoz | Alexa & Hitwise and Real Numbers, Oh My!

FReeper Adammon is right. Try this if you want to know more about Alexa and other hit aggregators : Alexa, Hitwise etc.