The service Ashton Kutcher took a stake in makes couch surfing much safer and attractive. Looking to head to L.A. but need a nice, unique place to crash that won't wreck your pockets? Give Airbnb a shot. The Facebook Timeline app will allow to share places you've stayed as well as let you browse for new locations. If you're looking to advertise your place, you can do so, too, using the Airbnb app.