Thomas Dalton wrote: We can't, of course, and no-one should take Alexa's data as representing anything other than Alexa's user base. The main reason why the Alexa rating is quoted so often is because its data is freely available, and updated in real time. However, the long-term trend of their figures does seem to correlate fairly well with other sources. Firstly, their traffic figures show the same general trend as Wikipedia's own internal measurements, and secondly, every so often, other organizations like comScore and Hitwise, which use different methodologies, publish the results of their surveys in press releases, and they show broadly the same overall trend as the Alexa data. -- Neil