Don't know how they came to this conclusion, if you look at the headers of https://twitter.com https://twitter.com its listed as "tfe". $ curl -v https://twi

Don't know how they came to this conclusion, if you look at the headers of https://twitter.com https://twitter.com its listed as "tfe". $ curl -v https://twitter.com [..ssl handshake and request..] < HTTP/1.1 200 OK < content-type: text/html;charset=utf-8 < date: Fri, 01 Nov 2013 11:12:31 GMT * Server tfe is not blacklisted < server: tfe [..body..] Also interesting to note that they are identifying sites such as "github.com", "dell.com" and "starbucks.com" as all using GWS[1]. [1] http://trends.builtwith.com/websitelist/Google-Web-Server http://trends.builtwith.com/websitelist/Google-Web-Server