I have created a java web application using spring. I want the users of my application can be logged automatically into my application when they are logged into facebook. Any help will be highly appreciated.
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It depends of your app. BTW, facebook have good documentation about this, you have to use javascript auth (there are many examples), with manually processing result or using facebook-java-api (look at
FacebookSignatureUtilfor example).PS you have to register your webapp at facebook before using facebook connect