The official Facebook SDK for Android supports single registration, so provided that the user has the official Facebook application installed and installed (this is very common these days), there is no need to provide them with your credentials for your application, they just go to the permissions page. If your users are not authenticated using the Facebook application on their device, they will need to provide them through the Facebook authentication dialog. Your users will be more likely to use Facebook features in your application if you use this approach in the authentication user interface.
Further information on the website SDK can be found on the SDK website.
jengelsma
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