Airbnb guests triple, hurting Priceline, HomeAway

Airbnb app on an iPhone and iPad.
Andrew Harrer | Bloomberg | Getty Images

Airbnb, which just surpassed 30 million guests to use the service at the end of last month, is taking over the vacation rental market at a breakneck speed, stealing customers from public companies HomeAway, Priceline and TripAdvisor.