I thought about the fact that Digg has a small cadre of people pushing most of the content, and something kept nagging at my memory. This morning I saw Scoble post on it, and - while he didn't mention what I'd been thinking of - it came to me anyway.

Malcolm Gladwell wrote a book about this awhile back: "The Tipping Point". In that book, he pointed out the existence of influencers, who have a disproportionate number of connections to other people - and who can thus spread new memes (in news, in software, in fashion - any community) very quickly.

What we see with Digg is just another example of that.

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