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That's a higher number than the number of people living in the UK. In fact, if royal wedding web viewers were to form a nation (perhaps one in which everyone wears fancy hats), it would be the 19th largest country in the world.
And those 72 million views only represent YouTube's official Royal Channel. Several other platforms also posted live video of the royal wedding. For instance, Livestream reported that the event set a new record on its site with 300,000 concurrent visitors.