“The Zuck-up.” Who is Facebook boss trying to impress by running in Beijing’s poisoned air? - The Washington Post

A political exercise?

"It is an open secret that Mark Zuckerberg is pretty keen to get Facebook unblocked in China. But is he taking things just a tiny bit too far?

On Thursday, the Facebook boss posted a picture of himself running through Tiananmen Square and telling his followers how much he enjoyed being back in the Chinese capital.
What he failed to mention was the air was a poisonous shade of grey, officially hazardous to human health. And he wasn’t wearing a mask."

“The Zuck-up.” Who is Facebook boss trying to impress by running in Beijing’s poisoned air? - The Washington Post