An example, and the very definition, of culture is the control of the flow of information.
US mainstream culture touts freedom of specech but maintains a very tight filter.
I'm sure we have all heard Martin Luther King's 'I Have a Dream Speech', which itself has been neatly packaged down to loop only certain parts; but how many of us can say we've ever heard
Marcus Garvey speak? Below is the 'Look for Me in the Whirlwind Speech'. We can fairly be divided into - those who have heard Garvey and those who haven't.