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b52_

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What do you mean? Modulo is not a perfect hash function... What if your hash table had size 11 and you hash two keys of 22 and 33?

I also don't understand your first point. We can run n^2 algorithms on massive inputs given its just a polynomial. Are you thinking of 2^n perhaps?

I completely agree with this article, and the parallels I draw from it (and some of the comments here) are extremely close.

But why is it that I read this article, agree with it, yet then continue scrolling HN or FB 2 minutes later? How can I get out of this dopamine cycle?

I suspect they do indeed use such URLs to track which link the user clicks. It's not that they log the IP with the click, but rather, the click allows implicit relevance feedback with respect to the issued query. This can be used for machine learning (to improve ranking, for example).