Pure chronological feeds break down at scale because they incentivize overposting by professional accounts, drowning out friends, and they ignore that recency isn't the only signal of relevance.

38:30will love. Yeah, it's tough because I mean I get I mean I posted this week this thing about agency and I just got destroyed in the comments which is just part of the job. I get it right. Um do you there's but there are a couple issues with the algorith with the chronological feed. So one is and some of this is the tension between an individual's interests and what works

38:53when you scale it up, right? So if you do a pure chronological feed, the incentive for everybody is to just post as much as possible uh because it will always be at the top of everyone who follows you's feed as soon as you post. So what ends up happening is that the feed gets overwhelmed with professional content with usually large company content and publishers because they get,

39:18you know, the New York Times can pump out 50 things a day. your your best friend won't you might get one thing a week from them and so your fee just gets taken over. Um so part of it is the incentives that emerge because when you when you design these systems it's almost like designing a city. You need to think about okay here's the here are the here's how the

39:39mechanics work. What are the incentives that arise? How are people going to act within those incentives? And then what happens? And the other thing is sometimes the most interesting thing was just not the most recent thing. Recency is an important input into relevance, but it's not the only one. My sister got engaged last night and you know she's in Germany. >> No, she didn't. If she did, she's

39:59married. >> She got married last year. That's why it was top of mind. >> All right. >> But if she got engaged, you know, and I missed it because she lives in Europe and you know, we're different time differences. Like, do I really want to see a picture of like my brother's pobo sandwich, you know, poboy sandwich, or do I want to like see my sister's things

40:15first? So, I I It's tough. It's tough. I'd love to figure out a way to find the right balance. I want to give people agency over the experience, but I think it needs to be in a way that creates a system that makes sense, not just for us as a business, which matters. I'm not pretending that's not an issue, but also for the overall community because we've