Engineering2h ago
Reel Friends: Building Social Discovery that Scales to Billions
Engineers on the Facebook Reels team developed the Friend Bubbles feature, which highlights friends' Reels interactions, using a machine learning model that evolved over time. The feature requires complex engineering work to balance behaviors between iOS and Android users, who have distinct interaction patterns. Ultimately, the team discovered a key factor that enabled the feature to function seamlessly, underscoring the importance of nuanced understanding in engineering seemingly simple features.
SocialScale
1 min