David Lieb

speaker

170 appearances 1 recordings 1 series first heard Jul 2026 last heard 9 Jul

David Lieb’s voice in public audio — every appearance, attributed to the second.

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Recordings per month over the last 12 months — 1 in all, peaking in Jul 2026 with 1.

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Y Combinator Startup Podcast · How To Better Understand Your Users · 9 Jul 2026 podcast

This is actually an idea that I remember hearing about 10 years ago from Max Levchin, one of the founders of PayPal.

They had a big fraud problem at PayPal when they first launched, but they didn't know the patterns to look for.

So what they did instead is build a visualization, a graph of all the transactions that were happening on PayPal.

And they just had humans sit and stare at screens of these drawings and graphs.

And while the humans didn't know what exactly was going on, they were able to look at the screen and say, that thing happening there, that's different and probably fraud.

And then they would go and dig into that.

It's kind of the same idea with dot plots.

You can look at these charts and figure out, huh,

There's something going on with users.

I see this pattern emerging.

And then you can go dig into it a lot deeper.

So to illustrate the point I was talking about where dot plots give you a lot more granularity about what's going on with the users, let's draw the DAU graph for these users.

So what you would have seen had you only been looking at your DAU graph.

I'll just draw it on top of here to illustrate.

So again, imagine each of these days is the same day above.

The DAU graph here looks like this.

So if you were just looking at DAUs, this is the graph you would see.

And it really doesn't tell you all that much.

It basically tells you, yeah, we're not growing.

We have some users.

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