Tencent, one of China’s top Internet companies, has launched a *harsh *crackdown on marketing *tactics on WeChat, its wildly popular social media platform. The campaign, kick-started last week, targets the marketing tactic known as “like-harvesting”, in which companies post pro duct- or service-promotion messages on WeChat via their “public accounts” and invite people to repost them to their own friend circles. Those who get a certain number of “likes” from their friends on the repost are *entitled to receive a reward from the company - a free sample of their product, a test drive, or even cash prizes.