Now that Twitter has totally killed their V1 API there is no official way to get Twitter feeds via RSS. Which is a real shame as RSS is a well accepted Open Standard for this type of information :-(

Creative Commons Attribution 2.0 Generic License (http://creativecommons.org/licenses/by/2.0/) by Jurgen Appelo

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The Twitter REST API v1 is no longer active. Please migrate to API v1.1. https://dev.twitter.com/docs/api/1.1/overview.
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SHAME ON YOU TWITTER !