Airbnb is an online hospitality service for travelers to rent or lease short term lodging. Founded by Brian Chesky, Joe Gebbia and Nathan Blecharczyk in 2008 - it is popular among young travelers looking for home stays, apartments and hostels (also probably my favourite app)

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Surprisingly it does not own any real estate, but has affected the tourism industry in 65,000 cities across 191 countries. Airbnb believes that in a global community, one can 'belong anywhere'.

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Postbnb - a mini campaign through a simple postcard exchange