they say imitation is the highest form of flattery, but evan spiegel may not feel that way.u think there is room for another social network in the facebook empire? sheryl: mobile time is exploding. people are using more and more mobile time, more and more social time. i remember interviewing for this job almost 10 years ago, mark saying more things would be social. that is what's happening. there is certainly room for a lot of companies to offer lots of great services. emily: i heard you talk about how much you enjoy visiting lean in circles and hearing other women talk about the challenges they are taking on. what new challenges do you want to take on? sheryl: i feel fully challenged. [laughter] sheryl: facebook just hit 2 billion users around the world. we know how deep our responsibility is. i love working with mark and the team on that. i'm glad i wrote "option b," it was emotional, but i think it was important. if it helps just one person, then that gives dave's life a little more meaning, and that has all the meeting in the world for me. emily: would you ever run for o

they say imitation is the highest form of flattery, but evan spiegel may not feel that way.think there's room for another social network in the facebook empire? sheryl: mobile time is exploding. people are using more and more mobile time, people are using more and more social time. i remember interviewing with mark for this job almost 10 years ago, mark saying more things would be social. that's what's happening. there's certainly room for a lot of companies to offer lots of great services. emily: i've heard you talk about how much you enjoy visiting lean in circles and hearing other women talk about the challenges they're taking on. what new challenges do you want to take on? sheryl: i feel fully challenged. [laughter] sheryl: facebook just hit 2 billion users around the world. we know how deep our responsibility is, and i love working with mark and the team here on that. i'm glad i wrote "option b," it was a emotional thing to do, but i think it was important. if it helps just one person, then that gives dave's life a little more meaning, and that has all the meaning in th