As the holiday lettings platform prepares for an IPO, what is Airbnb doing to clamp down on bogus, unregulated and unsafe property listings? Ed Butler speaks to Wired magazine journalist James Temperton, who uncovered one complex London-based scam involving fake listings, sham reviews and a block of grubby apartments that was in flagrant breach of the city's property rules. London councillor Heather Acton tells us she is horrified by the findings. So is Airbnb allowing professional landlords to profit by side-stepping property regulations and taxes? According to Murray Cox of the campaigning website Inside Airbnb, it is hard to gauge the true scale of the problem worldwide, because the online platform has been so cagey about releasing data. (Picture: Young man in despair sat on a dockside with his baggage; Credit: pankration/Getty Images)