Use this below URL and replace [USERNAME] with your Twitter username to use your Twitter RSS Feed:
http://api.twitter.com/1/statuses/user_timeline.rss?screen_name=[USERNAME] (Where [USERNAME] is your twitter username.)
That’s it, it’s really that simple.
How to Find Your Twitter Favorites RSS Feed
Your feed for only the favorites:
http://twitter.com/favorites/[USERNAME].rss (Where [USERNAME] is your twitter username.)
External web application to read your twitter feed http://www.twittertorss.com/
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