Alibaba's main Chinese competitor in mobile By: CNBC.com News October 02, 2014 at 14:33 PM EDT Despite its new prominence in the U.S., Alibaba's efforts in China to expand into mobile-the fastest growing part of e-commerce-faces challenges. Read More >> Related Stocks: 58.com Inc Activision Blizzard Alibaba Group Holding Ltd Baidu.com SP ADR Electronic Arts Facebook Forrester Resrch Gartner Inc Google, Inc. Jd.com Inc ADR Weibo Corp ADR