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Guess who's appearing at Facebook's town hall?

Mark Zuckerberg | Facebook

Facebook may not know what's about to hit it.

Indian Prime Minister Narendra Modi will make a guest appearance at the social media giant's Menlo Park, California, headquarters this month, CEO Mark Zuckerberg announced on Sunday, where he'll answer questions at one of the Facebook founder's 'townhall Q&As', answering questions put to him by Facebook users.

"I had the chance to visit Prime Minister Modi in India last year and it's an honor to have the chance to host him here at Facebook," Zuckerberg wrote in a Facebook post. "Prime Minister Modi and I will discuss how communities can work together to address social and economic challenges."

The post has attracted a stupendous number of likes and comments: 593,000 and 24,000, respectively, at last count.

Modi is the leader of the world's second-most populous country and a prolific user of social media himself. Throw into the mix the fact that his leadership has been both lauded as game-changing for India in its openness to reform and outside investment, and disappointing in the number of dramatic changes it has so far pulled off, and the likelihood is that interest in the event is only going to grow.

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Modi confirmed his attendance on Facebook and Twitter, urging users to post their questions ahead of the event.

"I thank Mr. Mark Zuckerberg for the invite to visit the Facebook HQ. I look forward to the Townhall Q&A," Modi said on Facebook. "The interaction will cover a wide range of issues and will surely be a memorable one."

Thousands of questions have since flooded in, ranging from what India can do to stop its "brain drain" to what the government is doing to clean up Delhi – the world's most polluted city - and everything in between.

The town hall will be held on September 27 at 9:30am PST/10 PM IST.

Modi's visit to Facebook is part of a week-long visit to the U.S., from September 23 to 29, during which he will spend two days in Silicon Valley in an effort to strengthen business ties between California and India.

Since assuming office last year, Modi and his team have adopted an aggressive social media strategy to engage in diplomacy and communicate directly with citizens.

He is the third-most widely followed leader on Twitter after U.S. President Barack Obama and Pope Francis, according to Twiplomacy, a website that tracks the use of Twitter, with 14.9 million followers.