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"Free Q&A sessions provide a public space for users to talk and communicate with each other," Zhou said. "But knowledge payment is a commodity ... a way to satisfy demand for specific services.

"Friendship is like money, easier made than kept," English author Samuel Butler once said, suggesting that maintaining a friendship for long periods is more difficult than the process of making friends.

"For UnionPay, the countries and regions involved in the Belt and Road Initiative are a priority. They are not only closely tied with China in many aspects but also are in need of infrastructure relating to transfer payments and digital payments," said Ge Huayong, chairman of China UnionPay, at the 10th Lujiazui Forum 2018 in June.

"Guangzhou's leading position as a trade hub has been consolidated since the reform and opening-up policy was introduced in the late 1970s, with a growing number of companies starting manufacturing businesses in the Pearl River Delta region," said Zhang Yueguo, director of the Guangzhou Academy of Social Sciences.

"Hainan has many natural advantages, and the island is home to many training and competition bases. A large number of international sport events including the Round-island International Cycling, the International Sailing Regatta, and golf tournaments have been held in the tropical island, which has made Hainan a popular international sports tourism destination," said Jiang.