WeChat is a popular messaging platform in China with over 889 million active users. The document discusses various marketing opportunities on WeChat including subscription accounts, moments advertising, banner ads, and key opinion leader (KOL) advertising. Case studies are presented showing how fashion brands, retailers, and location-based services have successfully used WeChat marketing. While opportunities exist due to WeChat's large user base and engagement, challenges include developing high-quality localized content and effective measurement of marketing campaigns. Setting up official accounts also requires registering a company in China.