Infrastructure consolidation

As any of you who follow my Twitter updates (@annejohn) will know, there are regular posts marked 'Infrastructure'. Fundamentaly, Twitter, Facebook, Google, Amazon, Apple and hundreds of businesses like those would not have anything like the reach and market that they do without the existence of the public Internet. The Internet exists as a collaboration between national and international Service Providers, purchasing core IP routers from Cisco and Juniper. The 'cloud', consolidating very large groups of servers into a small number of locations (data centers) where they are connected with access switches and more routers, has grown in effectiveness enormously in the last few years, driven particularly by Google and Amazon.