Disassemble friends in the social network?

Question

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There is a profile on the social network Vkontakte, let's say 4,000 friends on it.
I need to disassemble them all, tell me how best to do this? Are there specialized programs created for this? Something like this forms in my head:
Vasya and Petya are friends. Petya has some data (for example, the city of Saratov), ​​I would like to find, for example, Vasya's friends who live in Saratov, and their mutual friends from Saratov.

Answer 1

There are no ready made solutions. Everything you need is in the VK API documentation.

Answer 2

I can help you write something like this.
I have been working with VK data for quite a long time.

Answer 3

Or write the parser yourself (there is a simple API, but the documentation is tight). Or search through the application directory.