Why do people keep mentioning Twitter? It's not even vaguely related to what RSS does, any more than, say, a digital radio station you could tune iTunes to.
Even apps that make use of it will be moving away from the user being directly aware of it.
I've considered doing it as a stopgap, but it's just too laborious for sets of feeds numbering over 100, and will be inconsistent because some feeds will undoubtedly lack Twitter accounts.