Indian PM Narendra Modi (left) and Facebook CEO Mark Zuckerberg. Photo: 27 September 2015
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Why is Modi so interested in Facebook?

28 September 2015 Last updated at 02:54 BST

What is Indian Prime Minister Narendra Modi hoping to get out of his visit to Facebook's headquarters in California?

And why is Facebook chief executive Mark Zuckerberg so keen to host him?

The BBC's Dave Lee explains the motivations behind the high profile appearance.