I'd like to highlight that even if one added an URL-exists step [0], that doesn't do a dang thing for result-set problems of:

1. False-negatives, where relevant posts that do exist are not being shown (imagined or otherwise) to the user.

2. Posts which exist but don't fit the words the chaos-parrot uses to describe them.

3. "Relevance" being determined by unpredictable factors that aren't stable, predictable, or desirable.

In other words, it's just more whack-a-mole lipstick-on-a-pig third-animal-idiom-here.

[0] A bad idea on its own, since it creates a security vulnerability for data-exfiltration or indirect malicious attacks.