And it actually does avoid duplicates in the short term, as long as the submitted url is identical. I'm not sure what the time threshold is exactly, but I know

And it actually does avoid duplicates in the short term, as long as the submitted url is identical. I'm not sure what the time threshold is exactly, but I know if you resubmit something that has been submitted in the past few days, it will count it as a vote on the original instead.