If hired here at Pinterest 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 Pinterest is no different. For this question, it is important to understand the different mobile UI designs, and your job for this question will be tying the business needs of Pinterest into an effective mobile app. In your answer, talk about what you know about the business needs of Pinterest and then explain to your interviewer how you would build those into a great mobile app for their future.