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As mentioned in the post Amazon is often the goto website for linking books, I've never seen a link to Barnes and Noble on HN, Reddit or the like. I took care to make clear that this is a limited sample and didn't claim generalizability anywhere in the post.

Tagging the links was a conscious decision, but I do think that the approach of looking for Amazon links provides more insight than any other domain/online store.

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Probably. Labeling the links could make things less ambiguous, though. Either, "This website is supported by affiliate links" under the links to amazon. Or "I did this for fun but won't be able to host it w/out support. Please consider using this affiliate link to help out" and then providing both.

It's not super clear from the website whether this is something you did primarily to learn about data analysis, learn about HN's book recommendations, or to make money. Any of those is fine! But the motivation is likely to influence the outcome (even unintentionally) and it's something that could be made more clear.

I see the case for having a disclosure section that informs about affiliate links and don't mind adding that. But quite frankly, everyone who knows about affiliate programs can see that the links to Amazon contain that tag. No redirects or whatever fishy techniques I've seen to hide that.

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