There a 3 major statistics providers on the Internet.
- Alexa
- Quantcast
Alexa is probably the oldest but I never liked it since it was mostly based on people who installed their toolbar. Google is another provider that seems to have very accurate, secret sources (stuff that goes beyond what they could find from their search engine and analytics).
Quantcast is a very interesting one because it is the only one to provide demographics such as race and income. I am not going to comment on the accuracy except to say that I am a skeptic.

- Quantcast statistics on Digg. Source
And for comparison here is the Reddit one.

- Quantcast statistics on Reddit. Source
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