“On Ethereum, the same types of services offered by companies like Facebook, Google, Ebay, and Amazon, will be provided instead by computers distributed around the globe. But how does Ethereum bring together these scattered nodes into one network?…It’s the same technology that makes possible peer-to-peer exchange of Bitcoins without a bank keeping track of who owns what.”
Source: Can Ethereum Restore Online Freedom and Transform the Internet? – Reason.com