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What is that theory?

It's theory that people can contact with each other through 3 hand shakes .
As example 1st person tells to your neighbor that he needs new home.
2 hand shake - your neighbor tells you that 1st person needs new home.
And finally 3 hand shake you ask Premier to give for 1st person new home
Something like this.

We call this “6 steps to Kevin Bacon”. It’s the idea that there are no more than 6 “handshakes” or connections between any one person and the movie star Kevin Bacon.

Ok let it be 6 steps of Kevin Bacon 😉
Main idea the same. And it's always interesting to know for me such cultural differences in different countries how almost the same things can look like))