apparently, myspace is powered by pimpled faced geeks (see output below [X-PoweredBy]).

But that was said as a joke, talking seriously, there is no doubt, the web is powered by the open source software.

Most of the major sites, are using the tools which are not made at Redmond. There are however, some large sites which are exceptionally using the WISC stack, but amongst the largest sites, take the top 100, top 1000, you name it, they are the minority.

    root@clonezilla-srv:~# wget -O- --server-response --spider http://www.myspace.com/
    Spider mode enabled. Check if remote file exists.
    --2011-02-02 13:25:18--  http://www.myspace.com/
    Resolving www.myspace.com... 216.178.39.11
    Connecting to www.myspace.com|216.178.39.11|:80... connected.
    HTTP request sent, awaiting response... 
      HTTP/1.1 200 OK
      Cache-Control: no-cache, must-revalidate, proxy-revalidate
      Pragma: no-cache
      Content-Length: 74124
      Content-Type: text/html; charset=utf-8
      Expires: -1
      Server: Microsoft-IIS/7.5
      X-Server: 896c6f7da640823d4508c54f3b48fc12058736fbc4e59bcf
      Set-Cookie: MSCulture=IP=81.218.172.217&IPCulture=he-IL&PreferredCulture=en-US&PreferredCulturePending=&Country=SUw=&ForcedExpiration=634322139193426057&timeZone=0&myStuffDma=&myStuffMarket=&USRLOC=QXJlYUNvZGU9MCZDaXR5PUtmYXIgU2FiYSZDb3VudHJ5Q29kZT1JTCZDb3VudHJ5TmFtZT1Jc3JhZWwmRG1hQ29kZT0wJkxhdGl0dWRlPTMyLjE4MTcmTG9uZ2l0dWRlPTM0LjkzNTgmUG9zdGFsQ29kZT0mUmVnaW9uTmFtZT0wMiZMb2NhdGlvbklkPTA=&UserFirstVisit=1; domain=.myspace.com; expires=Wed, 09-Feb-2011 11:25:19 GMT; path=/
      Set-Cookie: SessionDDF2=8Q/cYHD2nDXwG4IfpqngrVTCZxMtlFsPs8sS2KKXpeayPKeoIq6z3xJLZvQ7dssRE48xuBfthlzlt6O7FCHJxQ==; domain=.myspace.com; expires=Sun, 02-Feb-2031 11:25:19 GMT; path=/
      Set-Cookie: MYUSERINFO=; domain=.myspace.com; expires=Wed, 19-Jan-2005 08:28:17 GMT; path=/
      Set-Cookie: MYUSERINFO=; domain=myspace.com; expires=Wed, 19-Jan-2005 08:28:17 GMT; path=/
      Set-Cookie: USER=; domain=.myspace.com; expires=Wed, 19-Jan-2005 08:28:17 GMT; path=/
      Set-Cookie: USER=; domain=myspace.com; expires=Wed, 19-Jan-2005 08:28:17 GMT; path=/
      Set-Cookie: SECUREUSERAUTH=; domain=.myspace.com; expires=Wed, 19-Jan-2005 08:28:17 GMT; path=/; secure
      Set-Cookie: SECUREUSERAUTH=; domain=myspace.com; expires=Wed, 19-Jan-2005 08:28:17 GMT; path=/; secure
      X-AspNet-Version: 4.0.30319
      X-PoweredBy: Pimple Faced Geeks
      Date: Wed, 02 Feb 2011 11:25:18 GMT
      Connection: keep-alive
      X-Vertical: globalsites
    Length: 74124 (72K) [text/html]
    Remote file exists and could contain further links,
    but recursion is disabled -- not retrieving.