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I imagine it does... It has to at least know who upvoted, to prevent revotes. The timestamp is frequently stored as well.
by michaelhart 16y ago
I imagine it does... It has to at least know who upvoted, to prevent revotes. The timestamp is frequently stored as well.
- Zev 16y agoIt has to at least know who upvoted, to prevent revotes. HN has to know who voted, not which way someone voted. HN doesn't let you change your vote once its been made, but it does let you downvote once you have enough karma.
- catch23 16y agoMaybe they use a bloom filter to store who voted per comment, that would be an efficient way to prevent upvotes without needing to store much data.
- nkurz 16y agoI don't think this would work well. The occasional false-positives would look like annoying glitches, every now and then making it look like your account had been hijacked by hiding the buttons as if you had already 'voted'. Although maybe I'm not getting the math right? Also, the existence of the 'saved stories' link from the user page would seem to indicate that for stories at least a full list is being stored.