Facebook App User IDs help developers target users by in-app actions

Facebook App User IDs are a new feature available to iOS developers who can use them to target their users by actions they took within their app. This is already available in the Facebook SDK for iOS, but will come to the Android SDK soon.

App User IDs are a component of Custom Audiences. Previously, advertisers could create targeting groups by hashed email addresses, phone numbers or user IDs. Now, developers have a way to target ads to their app users who haven’t logged in with Facebook or registered with an email address or phone number.

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