Limitations of the API
• Twitter only stores 6-9 days worth of tweets so historical search is
limited.
• A very small percentage of tweets are accurately geo-coded,
(estimation is about 1%).
• 150 unauthenticated (when not signed in) data request calls are
permitted per hour to the API. 350 authenticated calls (when signed
in) are permitted per hour.
• A search can only return 1500 results at a time.
NB: Most free tools that can be used to measure Twitter can access all
or parts of this data but usually fall victim to the API limitations
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