China social commerce ecosystem 2025: Douyin live streaming e-commerce RMB 3.2T GMV Viya Austin Li top influencers, Xiaohongshu RED 300M MAU KOC KOL seeding product reviews, WeChat mini-programs private traffic 900M users RMB 5T transactions, Pinduoduo 900M MAU group buying C2M farm direct Temu global, community group buying Meituan Youxuan, social retail distribution Pinduoduo affiliate
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