Think twice before using Twitter as a data source » Nieman Journalism Lab - 0 views
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All that’s not to say that Twitter’s not incredibly useful as a data source
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Just be aware of its limits and be careful about assuming what it produces represents any larger reality
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different versions of Twitter data can return different — sometimes even mutually contradictory — results
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"At Source, Jacob Harris notes that, as appealing as the Twitter API may be as a source of what-people-are-thinking data, it's hardly perfect. Twitter's demographics aren't representative of either Internet users as a whole or the broader population, and geocoding data is sparse and inconsistent. "