Jeremy Corbyn has been elected as leader of the Labour Party, and people have been very quick to air their views.
With Corbyn receiving 251,417 votes - 59% - in the first round, the election was far more certain in the end than many had predicted.
And it's prompted a flurry of opinion online.
It's fair to say some in the Labour party were less than pleased with the result.
Shadow cabinet member Jamie Reed quit on the spot
And so did Rachel Reeves
When I return from maternity leave in January I will serve my constituents in Leeds West, party & new leadership from backbenches. #Labour— Rachel Reeves (@RachelReevesMP) September 12, 2015
Gillian Duffy, the Rochdale resident criticised by Gordon Brown in 2010, reportedly gave her verdict.
Gillian Duffy has just texted me (seriously): "Vey sad will not vote Lab again" #labourleadership— Sophy Ridge (@SophyRidgeSky) September 12, 2015
The Tories reacted too
Labour are now a serious risk to our nation’s security, our economy’s security and your family’s security— CCHQ Press Office (@CCHQPress) September 12, 2015
But lots and lots of Corbyn's supporters appeared incredibly thrilled, and they were quick to express their delight at his victory.
Supporters in Central London were very vocal indeed
Now if you backed Jeremy Corbyn, you *have* to get active and involved to confront the huge challenges the movement now faces.— Owen Jones (@OwenJones84) September 12, 2015
I will follow Jeremy Corbyn anywhere. mostly because he looks like a wizard and I want to be in his fellowship— Lex (@lexcanroar) September 12, 2015
Jeremy Corbyn, one of the only politicians I’ve ever believed in has just won Labour Leadership against ALL odds. This is it.
This is it.— Rou Reynolds (@RouReynolds) September 12, 2015
CND congratulates Jeremy Corbyn on becoming Labour leader. It represents a massive step forward for our movement. #ScrapTrident— CND (@CNDuk) September 12, 2015
Jeremy Corbyn: "One of my first acts as leader of the party will be to join the demonstration this afternoon, to show support for refugees."— Alex Andreou (@sturdyAlex) September 12, 2015
And there's even a Corbyn fashion trend...
The Corbyn hat is on trend in Westminster today. pic.twitter.com/MeOFTIDFDz— Ned Simons (@nedsimons) September 12, 2015