Thursday, December 20, 2007

Alexa Ranking- Questions Finally Answered

Alexa is a website which ranks websites on the internet on the basis of their popularity.

I usually wondered how the
Alexa ranking is calculated.

Is it based on the number of page views or the number of unique visitors or is it based on the number of sites linking to it.

One among the inquisitive few asked Alexa about it and this was the reply they gave:

Thank you for contacting Alexa Internet.

Alexa bases all ranking information on the web usage of Alexa Toolbar users. We do
not have access to any web site's private usage logs. For more detailed information
about Alexa's traffic rankings, you can visit:

Now, as we said above, Alexa's traffic rankings are based on the usage patterns of
Alexa Toolbar users over a rolling 3 month period. A site's ranking is based on a
combined measure of Reach and Page Views. Reach is the percentage of internet users
who visit a site. Page Views are the average number of Alexa user URL requests for a
site, per Toolbar user. However, multiple requests for the same URL on the same day
by the same user are counted as a single Page View. The site with the highest
combination of users and Page Views is ranked #1.

Please also note that sites with relatively low measured traffic will not be
accurately ranked by Alexa. Alexa's data comes from a large sample of several
million Alexa Toolbar users; however, we do not receive enough data from our users
to make rankings over 100,000+ statistically meaningful. (Conversely, the closer a
site gets to #1, the more reliable its rank.) This means that, for example, the
difference in traffic between a site ranked 400,000 and a site ranked 800,000 is
statistically negligible. Sites ranked 100,000+ are subject to large ranking swings
due to the scarcity of data for those sites. In such cases, a single user (or the
lack of one) can make a dramatic impact.

We appreciate your interest in Alexa.

So alexa ranking largely depends on the number of visitors having alexa toolbar installed on their browsers.

For Lower ranking sites there can be a situation that the Alexa ranking is low compared to another site but has more number of page views than the other site.

So guarantee of Alexa ranking is only for sites having ranking less than 100,000


Anonymous said...

There are many social networking websites like Myspace, Facebook, etc. The main types of social networking services are those which contain directories of some categories, means to connect with friends and recommender systems linked to trust. Social networking services allow users to create a profile for themselves, and can be broken down into two broad categories namely internal social networking (ISN)and external social networking (ESN) sites, such as Myspace, Facebook and Bebo. An ISN is a private community that consists of a group of people within a company, association, society, education provider and organization or even an "invite only" group created by a user in an ESN. An ESN is open and available to all web users to communicate and are designed to attract advertisers. Hi5 is also a social networking website, which, throughout 2007, was one of the 25 most visited sites on the web. In hi5, users create an online profile in order to show information such as interests, age and hometown. They can upload user pictures where users can post comments. Hi5 also allows the user to create personal photo albums and set up a music player in the profile. Users can also send friend requests via e-mail to other users. When a person receives a friend request, he or she may accept or decline it, or block the user altogether. While hi5 maintains its strong hold in Central America, it faces tough competition in Asia from many social networking sites. comes in first ten ranking in

Unknown said...

Firstly, in Snapshot one can compare only three sites. Secondly, sites with less that 10000 uniques are excluded and thirdly, this is available only for the US audience. These three limitations still keep Google the favorite followed by Alexa.