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Is it possible, using the Vk API, to determine the list of the most frequently occurring groups from the collected list of user IDs that are members of these groups?
That is, for example, the list of user IDs 10000 was parsed, now it is necessary to determine which groups these users are in. And identify the most popular groups among these users.

Answer 1

https://vk.com/dev/users.getSubscriptions