Latency and magnitude are components of cultural impedance.
Latency shows how quickly a meme is absorbed by a culture:
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Pope's death is quickly accepted.... 
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But SARS virus is resisted 
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Relative magnitude is another component of impedance.
A high magnitude implies quick absorption; a low magnitude shows poor absorption:
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30,000 "blog" references is high (and still rising).... 
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while PNAC shows poor acceptance 
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