Alexa has recently changed it’s algorithm for computing the traffic rank. Instead of just relying on their toolbar and widget based traffic, they are now going to get traffic details from other sources and that would certainly make the rankings more credible.
Recently there was also some buzz on what should be considered as traffic and page views due to the heavy use of AJAX in Web 2.0 applications.
Just when you thought now we have a robust means of getting more accurate traffic rank, unique visitors, page views and related metrics, SAAS is going to start skewing these numbers. For a few of the SAAS websites I follow, anywhere from 50% to 80% of their traffic is coming either from their customers using their SAAS application (this is possible to figure out by looking at the traffic by sub-domain and most companies use a separate sub-domain per customer!) or using their forums, bug tracking (you would know if a SAAS company has development in India based on traffic by country!) and other internal applications. While this traffic is “Internet Traffic”, it is not a traffic in the traditional sense. There are not so many SAAS companies at present, but as time passes and more SAAS vendors sprout up, this is going to skew the stats a bit. Just an observation!