If hired here at Snapchat and tasked with helping design a UI for a new mobile app, what important factors would you consider in that design?

With consumer mobility being at an all-time high and only increasing year after year, just about every industry has entered the mobile app game and life at Snapchat is no different. For this question, it is important to have a good understanding of the different mobile UI designs and your job for this question will be tying the business needs of Snapchat into an effective mobile app. In your answer, talk about what you know about the business needs of Snapchat and then explain to your interviewer how you would build those into a great mobile app for their future.