Just a heads up to BrightSign and all.
It has been announced that the new Twitter API is removing support for RSS (and XML and Atom as well). From what I have read so far, this should not impact anyone right now, but will when the new API is mandatory on March 5, 2013 They are saying that people need to switch to JSON or other API methods to aggregate the twitter data.
So far this seems like it is going to be a big headache for developers all the way around:
http://mashable.com/2012/09/05/twitter-api-rss/
John