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Episode 669: A or B

Shoe store's camera tracking customers for A/B testing.

Dan Siroker wanted to increase the percentage of people who signed up for Obama's email list. So he created two versions of the website. Half the visitors saw version A with the "Sign up" button, and half saw version B, "Learn more".

That's A/B testing. And it is everywhere. It shapes everything online. It's invading stores. And schools. Even the first paragraph of this post was A/B tested. Today on the show: What you want and how we, and the rest of the world, give it to you.

Music: Barry Donnelly's "Awakening 1" and Aaron Gilbert and David Walters's "Take It Up (a)." Find us: Twitter/ Facebook/ Spotify/ Tumblr.

Copyright 2021 NPR. To see more, visit https://www.npr.org.