[A] way the Web has affected the human attention span is by allowing greater specialization of knowledge. It has never been easier to wrap yourself up in a long-term intellectual project without at the same time losing touch with the world around you. Some critics don’t see this possibility, charging that the Web is destroying a shared cultural experience by enabling us to follow only the specialized stories that pique our individual interests. But there are also those who argue that the Web is doing just the oppositethat we dabble in an endless variety of topics but never commit to a deeper pursuit of a specific interest. These two criticisms contradict each other. The reality is that the Internet both aids in knowledge specialization and helps specialists keep in touch with general trends.
He also explores how blogging accelerates learning.
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