Silicon Valley, April 27: Google, with a brand value of USD 66.4 billion, has unseated Microsoft as the world's most powerful brand, according to an annual ranking by a market research firm.

Silicon Valley-based Google is followed closely by General Electric (USD 61.8 billion), Microsoft (USD 54.9 billion) and Coca-Cola (USD 44.1 billion), according to the UK research firm Millward Brown Optimor.