Amazon, Flipkart battle in India for e-commerce's 'last frontier'

With 100 million new internet users every year, Amazon is betting big on India, but a major new investment in homegrown rival Flipkart means the battle to dominate the fast-growing e-commerce market is set to heat up.Flipkart announced this week that top international companies including Microsoft, eBay and China's Tencent had pledged investments totalling $1.4 billion, among the largest sums ever raised by an Indian start-up.The 10-year-old e-commerce company needs all the help it can get to co