Hi there, so everyone has a smartphone right, and 70% of those smartphones runs android. I'm a "blackhat" android developer and my question is... Can I build a list through my android application?? I mean ask for the user email and ask for confirmation and then sell things to them???? I think that anyone has tried this idea, and I can be a very targeted list if the app is per example about gaming... or something. Ummm it is worth trying??