In general, any way that you allow your current readers to share your posts with others will help your traffic. There's also the distinction between quality traffic (traffic that does something you want them to do), and junk traffic (traffic that is there for the benefit of the widget, and they don't do whatever other action you want them to do).
For example, on my blog, StumbleUpon traffic is junk. For other blogs, it works to boost RSS readership. You just have to experiment and see what works well.
Jay
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