He doesn't read them all. He uses an aggregator that integrates into Outlook. He skims them, marking those he wants to follow up on. After skimming, he goes back to the flagged messages. Most bloggers don't post every day, so that makes it easier.

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>OMG. In what insane world does Scoble live where that much information about what people had for lunch is valuable?
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>I'm glad I don't read or write blogs. I waste enough time on this wow-ee-internet thing the way it is.
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>Oooh, there's a flashing window... I wonder what that says...