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Comment by hinkley | Hacker News Reader

    Reddit has 52 million daily active users

You are sending 100B recommendations to 52 million daily users, that's 2000 recommendations per user per day. How many new subreddits do you think your users need to be made aware of in a given 24 hour period??

Just because you can do something doesn't mean you should.

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I doubt active users account for all of the recommendations. Consider inactive users who are on Reddit‘s mailing list. Those emails probably include recommendations as well.

There are still fewer than 10 billion people on the planet. I realize people can have multiple accounts, but realistically let's limit it to something like 1 billion actual users. Why does everybody need 100 recommendations a day?

It's a slight tangent, but it seems somewhat relevant - they're not only making so many recommendations, but the recommendations seem to be universally hated (judging by the comments here). It's like they're bragging about how epic their fuckup is.

it seems likely from the "Quest" section that they're using "recommendations" in the broader sense to describe the inputs to feed rankings and other parts of the product besides subreddit recommendations. i'm imagining that a single load of the personalized homepage might require hundreds of predictions.

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