Answer: Approximately 1.9 billion people.
McKinsey and company was founded in 1926. an American worldwide management consulting firm that was originally founded to apply accounting principles to management.
They were the first management consultancy to hire recent college graduates, rather than experienced hires.
They regularly publish books, articles and research about business and management.
In the year 2014, in one of their published articles, they published that approximately 1.9 billion people make use of social media actively.