Date: January 1, 2013 - 5:13AM
It is the revolutionary communications system used daily by billions of users - but few know this January 1 is the internet's 30th birthday.
The computer network officially began its technological revolution when it fully substituted previous networking systems on January 1, 1983.
Known as "flag day", it was the first time the US Department of Defence-commissioned Arpanet network fully switched to use of the internet protocol suite (IPS) communications system.
Using data "packet-switching", the new method of linking computers paved the way for the arrival of the World Wide Web.