

Top 500,000 web sites were analyzed and 1,422 are hosted on Amazon’s EC2 service platform, according to data from Infibase, which constitutes about 0.28 percent of the total samples.
The data offers fuel for cloud computing’s boosters, and its detractors as well. Although the economics of EC2 are perhaps more attractive for large-scale computing jobs than hosting web sites, the data suggests that a number of sites with meaningful traffic are using EC2 as their primary hosting provider.
For More Info please check the Infibase Website