A giveaway is that you can't comment on them :)

Nor do they have points, you can't upvote or flag them. They do stick out a bit and are easy to ignore.

You can hide them though.

There are several userscripts to block those.

<https://github.com/brownie-in-motion/hn-adblock>, discussed: <https://news.ycombinator.com/item?id=31597486>

Another: <https://gist.github.com/pxeger/4aed4baaa87028a2ecc6441a84a1f...>

(I've used neither.)

I've briefly looked into managing these through CSS alone. Not obviously that I can tell, though the text of job listings should match the pattern:

  <company> (YC <class> ) Is Hiring <position>

I think CSS can act based on content, but need to look at selectors for that.

SO suggests not: <https://stackoverflow.com/questions/1520429/is-there-a-css-s...>

HN doesn't assign a distinctive class to these posts, though the "votelinks" class is missing, which can be used to highlight the listings. E.g.:

  /* HN startup job ads */

  .athing td:nth-of-type(2):not(.votelinks) {
      background: #fcc;
  }

  .athing td:nth-of-type(2):not(.votelinks):before {
      content: "Ad";
      position: relative;
      left: 0.4em;
      color: #000;
  } 

(Other properties might be set.)

I'd need to futz with this some more to see if the entire entry could be dropped, though I'd prefer to simply have them stand out, I think...

If you are using ublock, you can use these filters

    news.ycombinator.com##.athing:not(:has(.votelinks))
    news.ycombinator.com##.athing:not(:has(.votelinks)) + tr
    news.ycombinator.com##.athing:not(:has(.votelinks)) + tr + tr

Putting an ad with text color #FEFEFE on a white background doesn't do much.

FTC actually has guidelines and rules for online advertising. Here’s a doc from them saying that the ads should be clearly marked as ads: https://www.ftc.gov/system/files/documents/plain-language/bu...

Strange it doesn’t seem to be respected on HN.

Lots of stuff isn't. They don't let you delete your account or delete old comments.