U.K.voters backed a "Brexit" from the European Union early Friday — a move which shocked markets and triggered strong reactions online.
The Twitter hashtag #Brexit topped the list of trending topics. Nigel Farage, a key player in the "Leave" movement, declared the U.K. had its "Independence Day."
SEE ALSO: David Cameron, Britain's Prime Minister, to step down after 'Brexit' vote
Some drew parallels to the populist nature of the Brexit campaign and the looming U.S. presidential election.
Others made jokes — some darker than others.
David Rothkopf, CEO and editor of FP Group, which publishes Foreign Policy magazine, referenced the plummeting of the British pound.
The official Twitter account for the popular political drama "House of Cards" posted a gif of the show's devious protagonist, Frank Underwood.
Others expressed dismay.
Former Oasis singer Liam Gallagher also weighed in Friday morning.
PHOTOS: See more Brexit reactions below
Reactions to 'Brexit'
Anti-establishment, populist, nationalist views leading to #Brexit parallels rise of Sanders & Trump in US & suggests Nov outcome uncertain
Of course Putin is happy about #Brexit. Undermining the integrity and success of the EU is a key project for him.
Conservative supporters of #Brexit completely under-estimate deeply disruptive effect of this vote and real harm to follow
"...and in the end, Britain, which had colonized the world, destroyed itself in fantasies that it was being colonized in turn" — historians.
Sterling gets trashed after #Brexit outcome but (cheeky) British wit shines through #EUref #FX $GBPUSD $EUR https://t.co/aFaQwYt4hH
The Brexit Diet: How to Lose Billions of Pounds in Just Minutes
That's enough fun for one evening. #Brexit https://t.co/zg149kEoVY
I'm so angry. A generation given everything: Free education, golden pensions, social mobility have voted to strip my generation's future.
Time to make a pot of tea and turn the television off for a while! 🙂
Stop the world im getting off LG x
No matter the outcome, #Brexit polls demonstrate how quickly half of any population can be convinced to vote against itself. Quite a lesson.