New answers tagged facebook
What is the Mobile App? Is it a e-commerce store, news portal, game? Because there is a huge difference between them. You should ask yourself how often your users use Login versus Sign Up. In most cases Sign Up is significantly less important than Login. If that's a case you MUST have 2 separate screens for Login and Sign Up. Why? remove additional noise ...
I think it depends what you're trying to do; as @Xabre said, without knowing what you're trying to do, it's hard to help you. At the most generic level, you should follow Facebook's sharing guidelines: https://developers.facebook.com/docs/sharing/best-practices
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