To make its iPhone messaging app run better—especially on older phones—Facebook rewrote it from the ground up. The new version is going live now. Along the way, it supplemented its original text-based ...

Facebook shrunk the size of its Messenger app, and stripped out some features, intending to make it faster to load and simpler to navigate. Some of the missing features will be back, though. The ...

The Facebook team focused on speed, size, and simplicity when redesigning Messenger from the ground up. The new design brings the app from more than 1.7 million lines of code down to 360,000, an 84% ...