As Chris said, the public API's return a JSON object, so it's fairly easy to make it into geoJSON. ArcGIS and geoJSON are kind of weird, because ESRI in their infinite wisdom decided that there should be an ESRI JSON format, which is different than geoJSON. Thankfully, ESRI also makes a converter, not to mention there is always GDAL for converting from geoJSON to shp. As a side note, you can load geoJSON directly into QGIS.
Anyway, I went ahead and uploaded a couple of Python script examples I've used in the past to collect tweets from the 1% Twitter public stream. You can grab API keys from Twitter and plug them into any of the scripts to get running right away. After you've got a json or txt file, you can parse out which tweets have coordinates. Basically get rid of any tweets that have "geo":null, since they don't have any coordinates.
https://github.com/dmofot/twitterstream
Hope that at least helps you get started.
DT
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