CEO Brian Chesky says Airbnb will not go public in 2018; CFO Laurence Tosi is stepping down to focus on his investment fund; Belinda Johnson becomes first COO Deirdre Bosa / CNBC : CNBC 2018-02-02 Airbnb, CFO Laurence Tosi, CNBC, Belinda Johnson, Brian Chesky, Deirdre Bosa