1. Are you sure people are more comfortable signing in on mobile? I'm not - I think twice as hard about letting people access a device that knows where I am. Mo

1. Are you sure people are more comfortable signing in on mobile? I'm not - I think twice as hard about letting people access a device that knows where I am. More important, have you done research into whether your target customer would sign in with mobile? I might buy a game or try a new app, but I rarely make any significant purchase on mobile. 2. I don't think you need to restrict yourself in order to constrain yourselves as long as you consider features in a "will this work well on mobile" mindset. 3. I disagree that mobile is a more open playing field. What exactly is your barrier with a browser on my computer vs. a browser on my smaller (phone) computer? Perhaps I misunderstand, but this doesn't make any sense to me. Glad to hear you'll be adding a web component. As I mentioned elsewhere, I'd also suggest you allow users to try the thing before requiring them to download and login - especially with Facebook, but even without. Service sites like Zillow generally do this well.