Here is Netmarketshare's methodology: "We collect data from the browsers of site visitors to our exclusive on-demand network of HitsLink Analytics and SharePost clients. The network includes over 40,000 websites, and spans the globe. We count' unique visitors to our network sites, and only count one unique visit to each network site per day. This is part of our quality control process to prevent fraud, and ensure the most accurate portrayal of Internet usage market share. The data is compiled from approximately 160 million unique visits per month. The information is an aggregation of the data from this network of hosted website traffic statistics. In addition, we classify 430+ referral sources identified as search engines."
Sign up for Computerworld eNewsletters.