It's not very clear if the upvote/downvote is for karma in HN or it's only for the internal point system in your site. I'm not sure if it's better to fix the redaction or to choose another word happy/unhappy face, lucky/unlucky, ¿great/meh?.

Are you planning to use this points to add some weight to the PRNG or they are only for the "more popular" list?

One spin, one acerbic comment. Damn my luck.