Amazon runs on Linux, Wikipedia prefers Red Hat and Fedora distributions, and eBay uses Solaris. Myspace is probably the only Web 2.0 project that runs under Windows.
A thorough study of the largest resources of Web 2.0 has shown what kind of web servers and operating systems are used there.
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As you can see, almost all Web 2.0 services work under Linux. There is no unity about specific distributions: Digg works under Debian , Wikipedia uses both Red Hat and Fedora at the same time.
Apache is traditionally used as a web server, but LigHTTPd is unexpectedly very popular.
*Note. MySpace uses a cache service (most likely. Akamai). So the result that it returns to the script (shows Linux OS) differs from the actual installed system on their own servers.