[benatkin]

The /By is also unnecessary. This certainly makes it easier to submit a story to HN multiple times.

[SquareWheel]

It's not too difficult to trick a filter on any page. I assume you can append a garbage query string for the same effect.

[benatkin]

Hmm, I guess the difference here is that the few people who will pick up on garbage query strings would likely miss an altered path, if it was made carefully.