On the contrary, we particularly tell YC founders not to do this—mostly privately, but there's a public version of it at https://news.ycombinator.com/yli.html (scroll down to "Comments" and see the part in bold. That's me trying to scare them.)
We do tend to be more lenient when there's no evidence of organized manipulation, just friends/fans/users trying to be helpful and not realizing that it's actually unhelpful. What dedicated HN users tend not to realize is that such casual commenters usually have no idea how HN is supposed to work.
But this leniency isn't YC-specific. We're actually less lax when it comes to YC startups, for several reasons.
Okay I have heard different things from some friends that are YC founders and saw them do it in practice (e.g. posting about their HN post on LinkedIn).
I'm not going to out people here but maybe it helps you to know that not everyone plays by the rules. Tbf I also understand that this is just really hard to enforce.
We do tend to be more lenient when there's no evidence of organized manipulation, just friends/fans/users trying to be helpful and not realizing that it's actually unhelpful. What dedicated HN users tend not to realize is that such casual commenters usually have no idea how HN is supposed to work.
But this leniency isn't YC-specific. We're actually less lax when it comes to YC startups, for several reasons.