After the Baidu.com buying frenzy last week on Wall Street, now Yahoo might be setting a new step on the Chinese maket. The company is in advanced talks to purchase a 35% stake in China’s biggest homegrown e-commerce company Alibaba.com for almost $1 billion, in what would be the biggest investment by a foreign company in China’s Internet industry to date, sources close to the negotiations said. Alibaba runs two sites, Taobao.com (auctions) and Alibaba.com (trading) that are both very popular in China.