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Ideally it's not. But I've seen all YC alumni and founders upvote all other YC company related posts within very short amount of time. Just add (YC Year) in subject line, and it gets an upvote from other YC fellow.

I guess everything is fair in love, war and marketing (your startup or you). :)

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How do you know who's upvoting those submissions?

Well, I am not YC alum nor applicant, but those headlines catch my eye, because they are invariably good and worth the read. They are the core of the content that I look for when I come to HN. And quite often I like them enough to give them a vote.

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