I wasn't aware that this is discouraged. Is that part of the guidelines? I couldn't find the relevant section at brief skimming/ctrl-f.

HN does "voting ring detection" IIRC and penalizes heavily news which are upvoted by many people in a short time. There is some logic to differentiate between voting rings and genuinely very interesting articles, but I don't know any specifics. Anyway, posting a link to HN submission anywhere else than HN has a good chance of making this submission dead.

We prefer to say please don't. :)

sudo don't ask for upvotes on Twitter. :P