The same week that industrial designers and roommates Joe Gebbia and Brian Chesky quit their day jobs back in 2007 to try and become entrepreneurs, the landlord of their SoMa apartment hiked their rent.
Faced with a sudden need to make some extra cash, they hit upon an idea. They knew that a major design convention was opening in town and that the hotels were fully booked. So they contacted the attendee list to offer airbeds in their apartment for people having trouble finding a place to stay.
The response was overwhelming and they quickly booked three guests, which netted them $1,000 or so, and in the process Airbnb was born, a community marketplace for people to list and find unique places to stay around the world.
Fast-forward to today, and Airbnb (which is headquartered in SoMa) is truly global in scope and has reached what Gebbia calls a "tipping point," with over 60,000 active listings in 12,663 cities in 181 countries. And just yesterday, it was announced that actor/tech fanatic Ashton Kutcher has invested a significant amount of money in the company and signed on as an advisor.