711 days ago, when there was a thread about karma levels and I just hit 500, I encountered the same phenomenon. I received a response saying that you don't get to downvote threads created prior to crossing 500. (Obviously, can't verify that, but here's the thread for context: https://news.ycombinator.com/item?id=3812967)
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Are you able to downvote? I'm curious what the karma threshold is for that.
500 is often reported but is incorrect. As of today, it appears to be 501.
711 days ago, when there was a thread about karma levels and I just hit 500, I encountered the same phenomenon. I received a response saying that you don't get to downvote threads created prior to crossing 500. (Obviously, can't verify that, but here's the thread for context: https://news.ycombinator.com/item?id=3812967)
I just hit comment down voting within the past few karma. So around 775
It was 500 when I hit it, but occasionally goes up. Not sure what it is now.
I hit it at 500 a few weeks ago. Ok, not sure exactly but definitely not more than 510 :)
What algorithm are they using? Is the source open?
HN is in fact open source (an older version of it anyway): http://arclanguage.org/
However much of the "secret sauce" is, well, secret.