I run a daily google alert on "clay christensen". It is admittedly broad but intentionally so. This was today's hit from John Borthwick on Silicon Valley Insider on the topic "Google Next Victim Of Creative Destruction?" It is well worth the read and includes great charts and metaphors. If you are interested in disruptive innovations or a historical perspective on the hubris that seems to characterize our behavior when we are on top of the curve and the whole topic of search on the internet, you will get something out of this.
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