Remember way back in High School, they had a couple of dozen boys and girls that were popular? All of them hung out by the tree in the courtyard or even at the one cool lunchtime table. Haha, yea you remember. They got popular for a reason and from time to time the group may increase by One or two.
Here's what went down in Highschool. 1 day, someone decided they and another person were going to start doing cooler things. One from the 2 people then wanted to add people to this group. So they chose others, other individuals with the exact same type of characteristics. They then started to edify one another. Fundamentally announcing cool things about one another around other people. Once that began taking place, those people who over heard, started repeating precisely what they just learned about the new "Popular" people.