Like mob. does the app send cookies to the browser?

Question

JavaScript

Hey!
Interested in the question:
How does the facebook or instagram application transfer cookies to mob. browser. And does it transmit at all?
That is, if I am authorized in the instagram application and went to the site with the facebook pixel - will he see that the cookies? knows that I am me.
Likewise with Yandex. If I am authorized in the Yandex mail application on my phone, but not authorized in Yandex in mob. browser. Ya.Metrika on any site will determine me?
Will determine - I mean for my statistics, gender, age, interests - for further targeting.

Answer 1

No way.
But there is one caveat - if you open a link in the browser to the application site from the application - be prepared for the fact that the application can attach a parameter to the link with which the social network will recognize you and set the cookie. If you do not open links from such applications with a browser, then transmission is possible only through the exploitation of some kind of vulnerability, and such cases must be reported.

Answer 2

If you ask for programming purposes, then the solution is to implement local data storage, emulate cookies. On the knee, two minutes.