I even learned this:
In Twitter's case, the users have been redesigning the tool itself. The convention of grouping a topic or event by the "hashtag" — #hackedu or #inauguration — was spontaneously invented by the Twitter user base (as was the convention of replying to another user with the @ symbol). READ THE REST
He did not mention the rate at which people sign up and then never use the service. At least not that I remember.
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