I notice that a lot of known entertainers have pages on these kinds of sites, so I guess it's definitely worthwhile for them.

I'm not sure how much time it's worth for someone starting to market something though.

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does anybody really succeeded in Affiliate Marketing through Myspace and Facebook. Or for that matter from any Social Networking sites...I have my own doubts with some IM Gurus selling $$ worth books about profits from these places.