Facebook CEO Mark Zuckerberg, left, and French President Emmanuel Macron meet at at the Elysee Palace, in Paris, France, Friday, May 10, 2019.  AP
Facebook CEO Mark Zuckerberg, left, and French President Emmanuel Macron meet at at the Elysee Palace, in Paris, France, Friday, May 10, 2019.  AP

France joins New Zealand to host summit to banish extremism on social media