Why I Love Twitter – O’Reilly Radar
In many ways, Twitter is a re-incarnation of the old Unix philosophy of simple, cooperating tools. The essence of Twitter is its constraints, the things it doesn't do, and the way that its core services aren't bound to a particular interface.
It strikes me that many of the programs that become enduring platforms have these same characteristics. Few people use the old TCP/IP-based applications like telnet and ftp any more, but TCP/IP itself is ubiquitous. No one uses the mail program any more, but all of us still use email. No one uses Tim Berners-Lee's original web server and browser any more. Both were superseded by independent programs that used his core innovations: http and html.