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i'm crawling user comments and its user ids in public links to build a graph, and i noticed some users have more than one ID. For example, this user have two different IDs: 100000571429851 and 993673107328394.
I'm not using different aps to get the user ids (someone told me user IDs changes between different apps).
Any ideas about how i can get a really unique ID for each user?
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No,you can't have two separate Facebook account using the same phone number. Because,when you signup in Facebook with a Number or Email,that number or email is saved on Facebook Database.
Fill in the details for your new account.Under the "Create an account" section, enter in the following: First and last name. Mobile number or email address (this must be different from any other Facebook account you have) Password.
Additionally, you can only create an account for one Facebook account per email. Since each account belongs to one person, we require everyone to use their authentic name on their account. This way, you always know who you're connecting with.
The reason for the different IDs is because this user is using a mixture of v1 and v2 facebook apps. The first ID is the user's personal ID and is returned when someone authorizes the v1 of an app. The second ID is an app scoped-ID and is returned using v2 of the facebook API. See the section in the facebook docs on App-scoped User IDs
https://developers.facebook.com/docs/apps/upgrading
Facebook will begin to issue app-scoped user IDs when people first log into an instance of your app coded against v2.0 of the API. With app-scoped IDs, the ID for the same user will be different between apps.
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