Where is the Passive Cashflow Income in the 21st Century?

Where is the Passive Cashflow Income in the 21st Century?
Partnering with Billion Dollar Companies to share profits with them by adding value to the companies, through word of mouth promoting and/or via social media and any way that you can think of to get the chosen companies heard and trusted by people via you.
Examples would be Network Marketing, Social Media Marketing, Affiliate Marketing, Content Marketing and more but these are the ones that most people can get started with and learn the skills all while building at it.
As the word "marketing" is used frequently up there, let's take a look at the definition of the word marketing: the action or business of promoting and selling products or services, including market research and advertising.
Reading books is a great way to start because the words read are stored into the brain, and the brain attracts things of similar nature.
Books that are highly recommend:
The Business of the 21st Century
Written by Robert Kiyosaki, this book contains very powerful information and is to read by people that are interested to live a financially free life.
Personal story: When I was in Malaysia, I was invited to a Millionaire's hotel suite. Near the end of his talk he said:
"My mentor told me to read this book 5 times"
PS: They both generate passive income of more than US $10,000 per month!
The Household Gold
This book contains golden information! It will make one realize how they have been a fool all along. Or at least think and wish that someone should have told them the information long time ago!
The Parable of Pipeline
This book informs the readers the difference between hard-work and smart work. It will also make you think for yourself about your current job and how you make your money. The story laid out in this book is probably the best way to inform people about active income and passive income.