What Alexa is most popular for – their traffic rank, is popular because it has been around for a long time and is well referenced. I don’t consider it to be a high value tool in terms of accuracy though. I think all these traffic estimation tools have a big margin for error, and its easy to read too much into the base/core number. Having mentioned that, you can try to use traffic data from Alexa, Google Website Trends / DoubleClick Ad Planner, Compete.com, and Quantcast to try to see how well they agree in terms of the traffic volume of a site or the relative volume between multiple sites in the same vertical.
In spite of my lack of faith in the Alexa rank numbers some people do put weight on it. Some investors use it. And when Markus Friend was launching PlentyOfFish he redirected Alexa users away from his site to stay below radar until his site was strong.
Full Story Via SEOBook.com
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