How to segment users in facebook analytics without a user id? -


i want run ab test tracked facebook analytics. wanted use user property segment results, testing our registration flow , user id not exist @ point. user properties cannot saved until user id has been set.

it seems have use event + parameter segment users. however, since event, potentially generated multiple times.

alternatively, set random user id @ startup. since i've been setting user ids match our backend's user ids think cause our data invalidated.

am missing options how work around issue?


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