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On its face the new Friend Bubbles feature looks simple enough. It highlights Reels your friends have watched and reacted to. But sometimes the features that seem the most straightforward require the deepest engineering work.

On this episode of the Meta Tech Podcast, Pascal Hartig chats with Subasree and Joseph, two software engineers from the Facebook Reels team, about what it took to bring Friend Bubbles to life. They discuss the evolution of the ‘ machine learning model behind the feature, the different behaviors between iOS and Android users, and the surprising discovery that finally made the whole feature click.

If you’ve ever underestimated a “simple” feature, this one’s for you.

Download or listen to the episode below:…

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