Word: hashtags
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...This is not just a matter of people finding a new use for a tool designed to do something else. 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). The ability to search a live stream of tweets was developed by another start-up altogether, Summize, which Twitter purchased last year. (Full disclosure: I am an adviser to one of the minority investors...
...this kind of innovation, and they go by different technical names. MIT professor Eric von Hippel calls one "end-user innovation," in which consumers actively modify a product to adapt it to their needs. In its short life, Twitter has been a hothouse of end-user innovation: the hashtag; searching; its 11,000 third-party applications; all those creative new uses of Twitter - some of them banal, some of them spam and some of them sublime. Think about the community invention of the @ reply. It took a service that was essentially a series of isolated microbroadcasts, each individual tweet...
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