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Yes, on my (every other day) posts I process comments too. If users leave in the comments section a link to their comment and they resteemed my post, their comment gets upvoted for free (but not resteemed, comments cant be). This feature is actually not advertised on the posts themselves.
I used to offer single upvotes on comments for 0.005 but due to the recent changes to Steemit Wallet I stopped offering single resteems and single upvotes. I will likely re-enable them in the future. =]

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