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Dunno, maybe that's the other one but as far as I know CouchSurfing is still alive and kicking (see: http://www.couchsurfing.org - they claim to have almost 3mln users), it's just that it isn't a commercial thing.

Couchsurfing and airbnb offer completely different services. Couchsurfing is free, and very focused on community building. It is definitely alive and kicking.

part of their success is due to being in the echo chamber. If you view their stats pre yc, I would of questioned their success as well.

"I bet the guys behind CouchSurfing are kicking themselves about now." - they're not in it for the money.

Ouch.