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So in addition to a social network, a condensed blogging platform and a mobile messaging solution, Twitter is now an RSS reader.
At least, that's what email newsletter service FeedBlitz seems to think: in addition to subscribing to FeedBlitz enabled blogs via email, you can now choose to receive updates via Twitter by entering your username and password on the subscribe form, provided the publisher is a premium user. Feed management service Feedburner also supports email subs, and provides FeedBlitz as an option, although it's not the default (enter your email address in the form in the Mashable sidebar to see how that one works).