Pope Francis met with Facebook founder and CEO Mark Zuckerberg August 29 at the Vatican. Zuckerberg with his wife Priscilla Chan shook hands with the pope before sitting down for talks. (Reuters)

When the leader of the Catholic Church and the founder of a website used by millions every day get together, what do they say to each other?

We might never know precisely, but it happened on Monday. And it seems Pope Francis and Mark Zuckerberg talked about how they each communicate with people all over the world, discussed their mutual concern about poverty and exchanged a model airplane.

The plane is a solar-powered vehicle that Zuckerberg, who founded Facebook and runs a charitable initiative with his wife Priscilla Chan, plans to use to deliver Internet access in remote, poor areas. Zuckerberg said (on Facebook, of course) that he and Chan gave the pope the plane when they met him at the Vatican on Monday.

The Vatican confirmed the meeting. In a statement, the Vatican said the 32-year-old CEO and the pontiff talked about using communication to alleviate poverty, but a Vatican spokesman declined to discuss the specifics of the conversation.

Francis, 79, has been a social media star since the beginning of his papacy in 2013 — most recently joining Instagram, a Facebook-owned photo-sharing site where he now has 3.1 million followers.

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