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I worked previously at a recommendation systems company where we also generated this sort of recommendation. It looked incredibly shoddy to us too, but what we found out was:

- yes, people who just bought a lot of batteries are actually more likely to buy more batteries soon. same for people who just bought a fridge.

- these recommendations may cause some sort of "burn out", where people stop looking, responding, or decide to unsubscribe. But this wasn't much worse than other recommendations. including the awesome ones.

- the loss from burnout was greatly outpaced by the wins in actually targeting the right users

Yes, these are bottom-of-the-barrel recommendations. But they work. And people don't care that much even if they disagree. Maths said so.

I think this is a similar story to the complains on non-literal searches in search engines. People think they want one thing, but they want something else.




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