And a week or so later, when you try to remem­ber what you said at this party, that really ter­rific thing, you rack your brain, but can’t quite come up with it. That’s Twitter.

The blog, on the other hand, is slow, reli­ably reference-able, and find­able. It’s like a speech, pre­pared in advance, with the text dis­trib­uted. Some will hear the speech on the day it’s deliv­ered, but oth­ers will be able to ref­er­ence its text across the years.