How does Facebook Camera know who I am before logging in, when I don't have the official Facebook app installed?
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Upon first opening the app, it displays a button saying "Continue as Oliver Cameron". How does Facebook Camera know who I am?
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Answer:
Apps can share iOS keychain data by sharing their app identifier prefix. This blog post covers how http://shaune.com.au/ios-keychain-sharing-data-between-apps/
Sriram Krishnan at Quora Visit the source
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