Ft Big Read

The headline valuations of some private tech companies are being tested by their IPOs, raising fears of an imminent correction, reports Leslie Hook. Numbers such as Uber's $50bn, Airbnb's $24bn and Snapchat's $15bn became symbolic of the huge ambitions of this generation of start-ups. But they are not all they seem  See acast.com/privacy for privacy and opt-out information.