I can’t tell you that.
But, I can tell you where the word describing such things came from. Copyblogger tells the story:
Richard Dawkins, an evolutionary biologist, coined a term that demonstrates the natural selection process for ideas.
He called an idea that spreads from brain to brain a meme. You may have heard of those.
Dawkin’s insight about the way ideas spread sprang from the intersection of genetics, social psychology, and cognitive science.
No fan of Dawkins here… but his application in growth of ideas does give something useful. You guys probably already knew this, but I had always wondered about where the idea of memes came from…turns out it was an idea about ideas.