How TripAdvisor changed travel

TripAdvisor is where we go to praise, criticise and purchase our way through the inhabited world. It is, at its core, a guestbook, a place where people record the highs and lows of their holiday experiences for the benefit of hotel proprietors and future guests. But this guestbook lives on the internet, where its contributors continue swapping advice, memories and complaints about their journeys long after their vacations have come to an end.