Next time you tell people about your ski trip on your social networking site, don’t be surpised if a ski supplier advertisement pops up. It is called hypertargeting and Myspace, facebook etc are all going in for it. They will use all sorts information about you, including messages and interests to target you with advertisements.
Good thing? I don’t know, it seems sort of spooky but I guess we will get used to it. It is only a computer after all, it is not as if a human is eavesdropping on our every move.
Bob Browning's blog 
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