For example, the Hong Kong Bus uncle case in which a middle-aged man - Chan Yuet Tung reacted furiously to a young passenger's request to lower his voice while traveling by bus, had a tremendous effect. Hong Kong teenagers borrowed Chan's expressions, radio programs and commercials drew analogies between their content and his behavior, video games were purchased because of the similarities existing between their characters and the protagonists of the bus quarrel (http://encyclopedia.thefreedictionary.com/YouTube). To conclude with, one could say that YouTube has both negative and positive effects. On one hand, it reveals undiscovered talents of ordinary people, offers freedom of speech and, implicitly, an alternative to unidirectional messages, and, on the other hand, it breeds violence because of the numerous users who are inclined to stand out by posting 'off-the-wall' videos. Yet, the possibility of freely expressing...

Probably, if YouTube had existed during the World War II, Hitler couldn't have manipulated the media for making Germans back up the Nazi party's policy.
Bibliography

Gelles, D., Fekeiki, O. (2006). Anti-U.S. video attacks spread on the Web. On the Internet at http://www.nytimes.com/2006/10/06/technology/06tube.html?ex=1177041600&en=1b3bc6835a7718dc&ei=5070.Retrieved April 18, 2007.

Theories on mass media (2004). On the Internet at http://www.tcw.utwente.nl/theorieenoverzicht/Theory%20clusters/Mass%20Media/.Retrieved April 18, 2007.

Information on YouTube (2007). On the Internet at http://encyclopedia.thefreedictionary.com/YouTube.Retrieved April 18, 2007.

Information on Geriatric1927 (2007). On the Internet at http://encyclopedia.thefreedictionary.com/Geriatric1927.Retrieved April 18, 2007.