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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.

"Food safety must be safeguarded by the rule of law, as it's what the public cares about most and relates to their safety and health," Zheng added.

"Fifty of the top law firms in the world are our clients. Two hundred of the top 500 companies in the world are our clients. We don't negotiate with them. They pay a fair fee," he said.

"For example, although growth of total individual deposits has shown a good performance in the industry, the base is not big enough," he said.

"For countries nowadays, data is the crown of trade. Promoting the opening and flow of data is part of the capital's efforts to drive data for advanced productivity," said Tang Jianguo, vice-director of big data application and industries at the Beijing Bureau of Economy and Information Technology.