How to understand what percentage of subscribers a page / public / group has, live, real, not cheated?

Question

Facebook

For example, there is a page on Facebook https://www.facebook.com/fcshakhtar/
1.5 million likes (subscribers)
on average, posts have 150 - 550 likes
and videos have 3,500 - 12000 views
. dead audience how it can be done on twitter and vk for example.
Also, if anyone knows, tell me on Instagram, is it possible to somehow calculate the real live number of subscribers there?

Answer 1

It seems to me almost nothing. Video - 1 person can repost to himself and he has 100,000 subscribers there. Views are growing. According to the likes of the records, they are most likely alive. But page likes are nothing.

Answer 2

For such an answer, you need information, you need to collect a graph of subscribers and friends on your own, it’s just another question to do with this information, but it’s quite possible that it will turn out to be simple.

Answer 3

only viewing manually will give you the answer to the question)