Android application using facebook

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http://stackoverflow.com – I'm interesting in develop android application with this format: Log in with facebook acount. Every user can save kind of data Every user can retrive the saved data of all his facebook friends which uses the application I want to know what is the best and the easier way to do this? to use a sql server which save all the facebook users id and all the data they saved, and the application will connect this data base? There is any other recommended way to this? (HowTos)