That doesn't seem like his point. I think he is pointing out that digg changed too much and changed too much of the UX and people got fed up and moved to the next best thing.
I don't think he's saying Zuckerberg is worried about reddit, he's saying Zuckerberg is worried about being a fad or a blip. And he should be. More than one metric is indicating that Facebook usage per-user is diminishing, or at least peaking.
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That doesn't seem like his point. I think he is pointing out that digg changed too much and changed too much of the UX and people got fed up and moved to the next best thing.
I don't think he's saying Zuckerberg is worried about reddit, he's saying Zuckerberg is worried about being a fad or a blip. And he should be. More than one metric is indicating that Facebook usage per-user is diminishing, or at least peaking.