How do apps like Path and Instagram report that contacts are also using the app?

I'm interested in creating an app that has a Find Friends by Contact feature similar to Path or Instagram, but I'm not sure how.

I know Path and Instagram upload your address book to their server, but how can they tell if a contact is using the app? Does it also download the user's phone number and thus match the phone numbers?

STATEMENT: I ​​do not store email addresses (or any information other than a contact phone number) in my address book, but somehow Path and Instagram can indicate if this phone number belongs to a user on path / Instagram. Like this?


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There are two points between your address book and their two connection points:

  • Your email address (and phone number).
  • Your friends refer to books that contain your email address (and phone number).

Basically, just because you didn't provide your email address doesn't mean you don't have them. They can also filter this "who has your email address in their address book" based on the names and / or phone numbers in your address book.

Yes, it can also connect by phone number. The point is, there are many ways to put data together, and your phone doesn't have a complete picture of what they have.



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