Learn about Facebook Pixel and how to retarget people on Facebook using Facebook Ad Manager
Here is how to solve the rotated images issue when you capture an image on android using android.media.action.IMAGE_CAPTURE intent with the code snippets.
This tutorial should help you understand how to implementing a custom TabHost that contains a ListView in Android.
Have you ever thought about or performed user testing for your product? Have you ever thought about using any of the user testing websites to understand how users think about your product?
Then here are some warnings/advice you might need to consider.