ForbesThursday Tech Wrap: Didi, Twitter, Amazon, SamsungForbesChina's biggest ride-hailing firm Didi Chuxing could soon become the world's second-most valuable startup. The company which bought Uber's China business last year is in talks to raise between $5 billion and $6 billion from investors, according to ...Didi Seeks $6 Billion Funding, to Become China's Second-Most Valuable Private FirmU.S.