BEIJING, China — Sina Corp., owner of China’s largest Twitter-like service, will push into mobile e-commerce through an alliance with Alibaba Group Holding Ltd. to revive flagging advertising sales. Alibaba, operator of the Taobao Marketplace and Tmall.com retail sites, will help Sina better target merchants wanting to place ads on its Weibo microblog service, Sina Chief Executive Officer Charles Chao said on a call today after the company posted a first-quarter loss. The call marks Sina’s first public comments detailing the partnership since Alibaba paid $586 million for an 18 percent stake in Weibo in April. Sina is focusing on mobile platforms to bolster earnings from advertising, its biggest sales contributor, after recording the smallest revenue gain in three years in 2012.…
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