The chairman of Google has delivered a snub to the firm’s competitors by naming e-commerce site Amazon as the search engine’s biggest rival in a surprising speech in Berlin on Monday. Eric Schmidt said: “Many people think our main competition is Bing or Yahoo. But, really, our biggest search competitor is Amazon. "People don't think of Amazon as search, but if you are looking for something to buy, you are more often than not looking for it on Amazon....they are answering users' questions and searches, just as we are.”