MP Jeremy Corbyn has been elected leader of the Labour Party in a landslide victory. After gaining 251,417 or 59.5% of first preference votes. Supporters chanted "Jez we did" as he took to the stage to deliver his acceptance speech.
Corbyn promised to fight for a more tolerant and inclusive Britain - and to tackle "grotesque levels of inequality in our society".
Here are our favourite reactions on Twitter...
