title: How to create a social network app on Android
body: <p>I want to build a social network app for Android. 
  But, I don't know where to start. I tried to search in <a href="http://developer.android.com" rel="noreferrer">http://developer.android.com</a> and many other tutorials. But, I didn't understand in data storage.
  In web development (PHP) for example, we need server and database (MySQL).
  How about the android app?
  I need to know the concept in developing social network app for Android,
  such as to store users' posts, comments, uploaded photos, google map data and so on.
  I don't want the code, I'm asking for idea and concept in developing social network app for Android.</p>
  
  <p>Any links to the suitable sites for me to start would be appreciated.
  Thanks.</p>