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I think sometimes the mods press a button to remove it (certain posts) from the front page if they don't think it belongs on the site.

I posted a Remind HN: Call your mom for Mother's Day. It did very well, then mysteriously disappeared, so your thesis is probably right.

Yea, I think I'm right. I've noticed posts on the front page disappear suddenly and got drowned several pages down.

> if they don't think it belongs on the site

But then it wouldn't have gotten any upvotes and wouldn't have hit the front page, would it?