It would never hurt to have an RSS feed. Some e-mail clients are the user's RSS readers also, and I'm sure there are many users who would like their site updates to be separate from their e-mail.
I would argue that Twitter and RSS are not one in the same. Twitter is about communicating and having a conversation with your users, not broadcasting every single article on your site. I'm not saying it's wrong to let people know about new articles on Twitter, but I would keep it to a very low minimum.
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