The post got more than a half million likes, including from Chinese state media (despite the national ban). But on Mr. Xi's propaganda page, Mr. Zuckerberg got only one mention -- in a list of the many tech executives who met the Chinese president. Europe's privacy pushback Last summer, emails winged back and forth between members of Facebook's global policy team. They were finalizing plans, more than two years in the making, for WhatsApp, the messaging app Facebook had bought in 2014, to start sharing data on its one billion users with its new parent company. The company planned to use the data to tailor ads on Facebook's other services and to stop spam on WhatsApp. A big issue: how to win over wary regulators around the world. Despite all that planning, Facebook was hit by a major backlash.