that it the obvious other reason - we’d like the default ex…

Samuel 22 Jan

try For You if you haven’t already. it’s really good

View feed on Bluesky 5 26 115

Luna 22 Jan

to be honest, make it the default discovery lol

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Samuel 22 Jan

we can’t because it doesn’t work until you’ve liked a bunch of things, so it understands you. I’d like to promote it more though

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Matt Kane 23 Jan

Also it runs on @spacecowboy17.bsky.social's home gaming PC, so probably shouldn't be the default for 40 million people. Something like it, but with bootstrapping for new users, would be ideal though

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Samuel

@samuel.fm

that it the obvious other reason - we’d like the default experience to run on our own infra so we can make sure it scales etc

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spacecowboy 23 Jan

What QPS does Discover serve today? For You serves ~20-25 (not counting the limit=1 requests)

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Luna 24 Jan

my milkman calculations give me 625 qps (25/40000)*1000000

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spacecowboy 24 Jan

That's interesting! Your assumption is that For You has 40K daily users and Discover has 1M, right? Here are some For You numbers for yesterday: - 70K users - 48K users who liked at least one post in For You - 770K likes on posts that were shown in For You - 1.62M feed requests

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Luna 24 Jan

oh wow more users than actual likes, wouldn't have expected that. I thought it would be like 40k likes and idk 8k users. also I am aware that my calculation is heavily flawed lol

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spacecowboy 24 Jan

Yes, liking the feed involves quite a few clicks. Once you have pinned the feed you would need to go out of your way to like it. That's why I add (with 20% probability) a reminder post into the feed to nudge people to like it: bsky.app/profile/spac...

spacecowboy@spacecowboy17.bsky.social· 14 Dec 2025

How to like and pin the feed:

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spacecowboy 24 Jan

Also see: bsky.app/profile/spac...

spacecowboy@spacecowboy17.bsky.social· 21 Jan

For reference, of people with 100+ visits - 35% have liked the feed:

Users with 1+ visits: 209,195 users with an 18.97% like rate.
Users with 2+ visits: 155,712 users with a 24.09% like rate.
Users with 10+ visits: 114,178 users with a 28.32% like rate.
Users with 100+ visits: 47,830 users with a 35.01% like rate.
Users with 1000+ visits: 5,509 users with a 43.06% like rate.
Users with 10000+ visits: 257 users with a 36.19% like rate.

spacecowboy 24 Jan

- This is 0.47 likes per request Yesterday Bluesky had (bsky.jazco.dev/stats) - 22.3M likes - which includes likes on replies that For You and Discover don't show - 1.2M users who liked at least one post

Atlas - Engagement-Based Social Graph for Bluesky by Jaz (jaz.bsky.social)

bsky.jazco.dev

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spacecowboy 24 Jan

How many likes out of 22.3M is Discover responsible for? We should exclude likes on replies. I would guess that 30% of the likes are on replies. But why guess? We can sample likes from Jetstream and check if the liked post has a parent. It turns out that 22.7% are on replies.

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spacecowboy 24 Jan

Which leaves ~17.2M likes on posts. How many of those likes come from Following? I would guess at least 50%. Let's say all custom feeds are responsible for 25% and Discover is the remaining 25%. This would make Discover responsible for 4.3M likes. This is 5.6x more than For You's 770K likes.

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spacecowboy 24 Jan

Sure, being the default feed means the number of likes per feed request is smaller compared to For You - which self-selects more active/advanced users. Let's assume it is 50% of For You's request-to-like conversion. This would make Discover handle 11.2x more requests.

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spacecowboy 24 Jan

11.2x is in the same ballpark as your 25x estimate!

Luna 24 Jan

ok that milkman saying apparently doesn't exist in English and just in German, "Milchmädchenrechnung"