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But the stakes might be even higher for Facebook. The social network, which has been in the international spotlight over misuse of its platform by outside companies and groups, says it uses a combination of automated and manual systems to identify fraudulent and suspicious activity.

By March this year, companies incubated in the project have raised a total of 64.4 billion yuan (.5 billion). Five companies have gone public while at least 13 firms have become unicorns—a startup valued at more than billion.

But the situation is about to change for Yang and his fellow villagers as China Galaxy Securities, a State-owned business, is attempting to boost road connections in Yangzui, where apple trees provide nearly half of farmers' income.

But, there are concerns over the practice. One obvious worry is that symptoms can be easily missed through online medical consultations, warns David Ellis, a Hong Kong-based partner with global law firm Mayer Brown. He focuses on healthcare services.

But the current crisis has turned into the worst in three years. New Delhi Chief Minister Arvind Kejriwal has called for a range of measures to fight what he described as "unbearable pollution".