Read the full story at the Haiku Society of America.
Matsuo Kinsaku was a master of this form of poetry, and attracted many students and supporters. (In those days, it was actually possible to make a living as a poetry master!) But around 1682 Matsuo became dissatisfied and started traveling around Japan.
As he went, he wrote compressed travelogues interspersed with very short poems. They were kind of like those initial verses, except instead of being used to start a collaborative chain of linked verses, they stood on their own.
Over time, his new approach gained popularity, power and subtlety. His students collected his verses into volumes, and added their own -- except now, instead of the short verses being linked together into chains, each one stood on its own. The concept of haiku, as a standalone poem, was born.
Since the 17th century it's been primarily an individual activity, like other poetry: The poet, transfixed in a moment of solitary inspiration, writes a haiku and then, later, publishes it.
Of course it doesn't always happen exactly like that, but that's generally the outline of how we think of haiku -- and other poems. They're the product of one mind, usually, and they stand on their own.
But on the internet, haiku don't have to be like that. Indeed, one haiku may spark a whole chain of responses, turning it into something more than just a poem on a page.
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