Facebook login for web and device generate different uid for same user -

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we trying update facebook login device , found out different uid generated while login via pc browser , device login method. uid generated browser can user feeds, return empty uid generated device login. know why there different uid same user?

it's design unrelated apps can't correlate users.

straight from upgrade docs, emphasis mine;

  1. app-scoped user ids

facebook begin issue app-scoped user ids when people first log instance of app coded against v2.0 of api. with app-scoped ids, id same user different between apps.

no matter version used sign app, id remain same people have logged app. change backwards-compatible has logged app @ point in past.

if you're not mapping ids across apps, no code changes should required. if need map same user ids across multiple apps or run cross-app promotions, we've added new api called business mapping api. lets map logged-in user's ids across apps long apps owned same business.


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