Exclusive: Baidu, JD.com to join others investing $12 billion in state-owned China Unicom - sources

By JulieZhuHONG KONG (Reuters) - Baidu Inc and JD.com will join other big Chinese technology firms to jointly invest about $12 billion in the Shanghai-listed unit of China Unicom, the weakest of three big state-owned telecoms firms, two people with direct knowledge of the matter said.Beijing added China Unicom last year to a first batch of state-owned enterprises to see mixed-ownership reform.China Unicom, formally known as China United Network Communications Group Co Ltd, is one of the world's