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Twitter can be incredibly valuable as an open communications mechanism, but if you close too many things down too quickly, if you think about it too short-sightedly, you could easily do a lot of damage to that ecosystem.

Twitter didn't make up the hashtag. Twitter didn't make up the retweet. It's our users. And people started using them so much that we decided to weave them into the product. I can't think of another company that has taken its users' actions and said, 'We're going to make them useful to everybody.'

Twitter has already birthed an entire ecosystem of other sites that extend its power or interact with it. But Twitter isn't just a platform for technological innovation: It's showing signs as an engine of creativity for the language, too.