growing popularity of new and emerging media like the internet, especially among the youth?

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With the growing popularity of new and emerging media like the internet, especially among the youth, many social networking sites have emerged. For marketers targeting the youth, what are the advantages and disadvantages of such new media spaces? With relevant facts and figures, discuss the growth of internet as a medium of advertising, giving details of new growth avenues within the medium. Also, how is this going to affect conventional media companies?