GNU/Linux is about empowering users to a choice. Linux is a kernel (guts of an OS). GNU/Linux is the kernel with GNU tools to form a complete OS.
GNU is a software revolution that is open and free in every since of the word. The code (software) is open to anybody to download and/or modify as long as you share the modifications with others. This is an open concept like university research. Everybody benifeits from the colaboration of others. In a closed enviornment inovation and quality are stifiled.
heep://www.urbandictionary.com uses Linux and very glad to see they know what they are doing by using php.