September 2, 1969: the internet (Arpanet) consisted of two computers.
1969: Computers at two academic departments in California are linked by Arpanet, the predecessor of the internet.
1974: TCP/IP - Vint Cerf and others publish a proposal to link up Arpa-like networks. It has no central control and is built around a protocol (TCP/IP) for the exchange of data
1991: First web page published. The web goes public. Its first page explains it is a 'wide-area hypermedia information retrieval initiative'.
2006: Twitter. The 140 character service launches. Many who initially try it think it pointless.