The current and former Facebook employees caution that the software is one of many ideas the company has discussed with respect to entering China and, like many experiments inside Facebook, it may never see the light of day. The feature, whose code is visible to engineers inside the company, has so far gone unused, and there is no indication that Facebook has offered it to the authorities in China.
But the project illustrates the extent to which Facebook may be willing to compromise one of its core mission statements, “to make the world more open and connected,” to gain access to a market of 1.4 billion Chinese people. Even as Facebook faces pressure to continue growing — Mr. Zuckerberg has often asked where the company’s next billion users will come from — China has been cordoned off to the social network since 2009 because of the government’s strict rules around censorship of user content.
The suppression software has been contentious within Facebook, which is separately grappling with what should or should not be shown to its users after the American presidential election’s unexpected outcome spurred questions over fake news on the social network. Several employees who were working on the project have left Facebook after expressing misgivings about it, according to the current and former employees.
A Facebook spokeswoman said in a statement, “We have long said that we are interested in China, and are spending time understanding and learning more about the country.” She added that the company had made no decisions on its approach into China.
Facebook’s tricky position underscores the difficulties that many American internet companies have had gaining access to China. For years, companies like Google and Twitter have been blocked there for refusing to yield to the government’s demands around censorship. In 2010, Google said it was directing users of its search engine in China to its service in Hong Kong, because of censorship and intrusion from hackers. Other companies, like the professional social networking service LinkedIn, agreed to censor some content on their platforms in China.
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The current climate for internet companies in China may not help Facebook. In August, the ride-hailing giant Uber gave up an expensive battle to crack the Chinese market, selling its Chinese business to an incumbent rival, Didi Chuxing. More broadly, China has streamlined and tightened its controls over the internet under President Xi, targeting influential social media celebrities and adding new reviews to popular online video sites.
Still, some officials responsible for China’s tech policy have been willing to entertain the idea of Facebook’s operating in the country. It would legitimize China’s strict style of internet governance, and if done according to official standards, would enable easy tracking of political opinions deemed problematic. Even so, resistance remains at the top levels of Chinese leadership.
Some analysts have said Facebook’s best option is to follow a model laid out by other internet companies and cooperate with a local company or investor. Finding a partner — and potentially allowing it to own a majority stake in Facebook’s China operation — would take the burden of censorship and surveillance off the Silicon Valley company. It would also let Facebook rely on a local company’s government connections and experience to deal with the difficult task of communicating with Beijing.
Facebook and Chinese officials have had intermittent talks in the last few years about the social network’s entering the market, according to employees who were involved in the discussions, though the two sides have been unable to reach a compromise.
Facebook currently sells advertising for some Chinese businesses from its Hong Kong office. Among its customers are state-media sites that act as the propaganda arm of the Chinese government, and that operate official accounts where they post articles. Chinese citizens who wish to gain access to Facebook must tunnel in using a technology known as a virtual private network, or VPN.
It’s unclear when the suppression tool originated, but the project picked up momentum in the last year, as engineers were plucked from other parts of Facebook to work on the effort, the current and former employees said. The project was led by Vaughan Smith, a vice president for mobile, corporate and business development at Facebook, they said. Like Mr. Zuckerberg, Mr. Smith speaks a smattering of Mandarin.
Unveiling a new censorship tool in China could lead to more demands to suppress content from other countries. The fake-news problem, which has hit countries across the globe, has already led some governments to use the issue as an excuse to target sites of political rivals, or shut down social media sites altogether.
Over the summer, several Facebook employees who were working on the suppression tool left the company, the current and former employees said. Internally, so many employees asked about the project and its ambitions on an internal forum that, in July, it became a topic at one of Facebook’s weekly Friday afternoon question-and-answer sessions.
Mr. Zuckerberg was at the event and answered a question from the audience about the tool. He told the gathering that Facebook’s China plans were nascent. But he also struck a pragmatic tone about the future, according to employees who attended the session.
“It’s better for Facebook to be a part of enabling conversation, even if it’s not yet the full conversation,” Mr. Zuckerberg said, according to employees.