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Yes, this is all done on a public ledger.

Yikes. I don't like the idea of being seen down voting. I can imagine getting a lot of problems for doing that. How does the site tackle spam?

Through downvotes. @steemcleaners if you want to help but fear retaliation (or just need more vote power)

Thank you all for this conversation and thank you @rodent, I learnt something here! I can think of several cases when @steemcleaners could be applicable. Now I know what to do in the future. All the best, Klaudia