World leaders with them will pledge action to eliminate terrorism, violence and extremism from social media and other online platforms.

The meeting hosted by French President Emmanuel Macron and New Zealand Prime Minister Jacinda Ardern is entitled Christchurch Call after the gunning down of 51 worshippers at two mosques in that city in March by a white extremist.

It also brings in Macron’s Tech For Good project.

In attendance are Jordan’s King Abdullah II, Canadian premier Justin Trudeau, British Prime Minister Theresa May and European Union Commissioner Jean-Claude Juncker.

Twitter founder and chief executive Jack Dorsey is there along with Nick Clegg, the former deputy British Prime Minister whose become Facebook’s vice president for international affairs.

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