[molf]

Most likely all information was gathered automatically. According to their FAQ (on the right side of the page) they check the homepage and attempt to detect the presence of any of the listed technologies.

I agree pie charts are probably the worst way to visualise the statistics. For example, it gives no sense at all of the ubiquity of any technology.

Also the accuracy seems to be lacking. I was surprised by seeing their (automated) claim that only 85% of the sites use CSS. That seems strange since I can't actually remember having seen a site recently that doesn't use CSS on its homepage. Checking some of the unlisted sites confirmed my suspicion; they just failed to detect CSS on those pages.

Finally, these statistics only give insight into what is used on the home page of the given domain. The home page may just be part of a (separate) marketing website, so don't be fooled into thinking these statistics represent the products/services built by these companies.

Disregarding all the problems with these stats, it is indeed interesting to see a comprehensive list like this. I find their list of technology trends [1] even more interesting, though.

[1]: http://trends.builtwith.com/