Guinness has entered a ‘golden age’ with authenticity-craving millennials—and owner Diageo probably has social media to thank

Guinness has entered a ‘golden age’ with authenticity-craving millennials—and owner Diageo probably has social media to thank

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If you’re in London this St. Patrick’s Day, you’re likely to find a decent-quality Guinness within a few hundred meters.

But it wasn’t always that way.

The drink that dates back to 1759 is entering its “golden age” and defying an industry setback faced by other brewers amid a rush for “premiumization” by leaning into its own form of premium: that of dominating the social media landscape.

It has scared bartenders into the perfect pour and ultimately propelled Guinness to remarkable growth, and the brewer isn’t resting on its laurels.

A ‘good’ Guinness

It’s easy to tell how nice a Guinness is likely to taste just by looking at it, admittedly after a bit of committed practice.

A well-poured Guinness will have a creamy, domed head that is not too large and not too small. When tilted, that head should be able to stand up under its own weight on the side of the glass, passing what is described as the “tilt test.”

It shouldn’t be too cold either, with Guinness recommending a pint be served at a balmy 6-7 degrees Celsius (around 42.8 degrees Fahrenheit). Traditionalists cringe at the company’s “Extra Cold” version, which comes in a few degrees Celsius cooler.

There are a few reasons why a pint of Guinness can vary in quality. The distance the Guinness travels along that pipe is important. One bar that serves less Guinness is likely to taste worse than one that serves more because Guinness is best when served fresh.

It’s a fairly exhausting and emotion-inducing process to create a pint—no other brewer can compete with the level of detail that goes into pouring it or the free marketing that its debate incites among its customers.

Mark McEvoy, a Dublin-born landlord of the Three Crowns pub in Old Street, London, puts more effort into his Guinness than any other drink.

And for good reason. McEvoy says the bar sold more than 18,000 pints of Guinness last year, more than double its next most popular drink, Camden Hells lager.

He says interest in the black stuff has seen a huge rise in the U.K. capital in recent years—his pub didn’t even have the drink on tap when he moved five years ago.

Bartenders in the city rarely abided by the arduous process of pouring a Guinness, including the fabled “two-part pour,” but he says that has changed.

“A lot of that has to do with people taking pictures on social media,” McEvoy told Fortune.

“I think the quality has definitely improved in the last couple of years, I notice more and more bars are paying attention to the quality of the serve.”

In addition to ensuring the conditions are in place for a good pour, McEvoy has to train bartenders across the city to make sure they do it right.