There are several disadvantage of Alexa ranking. is that depends on the Alexa toolbar.
• Not everybody has the Alexa toolbar installed, so there might be millions of Web sites that, even if they have a lot of traffic, will not be ranked (or not high enough) by Alexa. It is rather relative.
• Fairly small sample size of audience (those that have the Alexa toolbar installed) to measure marketing efforts
• Due to the small sample size, there are millions of websites that may get a lot of traffic but are not ranked by Alexa.
• Many people feel that Alexa traffic can be “gamed” to therefore show inaccurate results.
• Many people say that it is inaccurate and that Alexa traffic can be greatly influenced (or “gamed”, as some prefer to call it).
• Subdomains are not ranked separately, and neither are subpages within a domain. The overall traffic is calculated for the top-level domain only.
• Alexa tollbar is only available on firefox and IE browser.
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