I recently co-founded a startup (http://outpost.travel) that aggregates the 'sharing economy'. So far we've had a great response to it from investors and users. It's been a crazy experience going from idea to MVP to where we are today and I get exactly what they mean when they say to keep an eye on startups/sites like Airbnb/Vayable. Almost all our users hadn't known about Airbnb before we introduced them to the whole P2P travel experience and quite a few then booked experiences, rideshares and place rentals using us. The one think that I am concerned about is that quite a few federal/state tourism agencies are now banning P2P travel as theres no taxes being made and it takes away from bigger chains such as Hilton and Holiday Inn.