How to analyze subscribers?

Question

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There is a group of 300,000 people.
Is there any service that will create a certain replica of the interests of competitors' users?
We need some kind of paid service where you can drop groups for analysis
and get:
- top 100 publics where people are members
- People are most often interested in this and this.

Answer 1

I haven’t seen the service, but in general you can write it yourself

Answer 2

socialite.ru