Why Meta’s Billion-User Apps are Switching from C to Rust?

C's Downfall: Meta's messaging apps used an old C codebase causing memory issues, crashes, & poor dev experience. C's Downfall: Meta's messaging apps used an old C codebase causing memory issues, crashes, & poor dev experience. Perplexity AI Video Generator

Memory Nightmare: Manual C memory management led to severe, hard-to-debug crashes (use-after-free, double-free) causing Site Events. Memory Nightmare: Manual C memory management led to severe, hard-to-debug crashes (use-after-free, double-free) causing Site Events.

Productivity Drain: Debugging critical C memory bugs took weeks & half a project team's effort, per engineer Buping. Productivity Drain: Debugging critical C memory bugs took weeks & half a project team's effort, per engineer Buping. Google's Core Update 2025

Code Chaos: C's lack of abstractions forced error-prone patterns: declare vars early, free 1000+ lines later. Reviews were hell. Code Chaos: C's lack of abstractions forced error-prone patterns: declare vars early, free 1000+ lines later. Reviews were hell.

Open Culture Pain: Meta's open codebase worsened C issues. No interfaces/strong types made clean abstractions impossible, leading to messy code. Open Culture Pain: Meta's open codebase worsened C issues. No interfaces/strong types made clean abstractions impossible, leading to messy code. Is Apple Buying Perplexity?

Rust's Solution: Rust's ownership system & borrow checker prevent memory bugs (use-after-free, double-free) at compile time. Rust's Solution: Rust's ownership system & borrow checker prevent memory bugs (use-after-free, double-free) at compile time.

Dev Tool Boost: Rust's tooling (Rust analyzer, rustfmt) offers real-time feedback, AI autocompletion & auto-formatting, improving productivity. Dev Tool Boost: Rust's tooling (Rust analyzer, rustfmt) offers real-time feedback, AI autocompletion & auto-formatting, improving productivity. What is Vibe Testing?

Standardization Win: Rust's newness enabled cleaner, standardized code across teams, avoiding C++'s bloat and inconsistency. Standardization Win: Rust's newness enabled cleaner, standardized code across teams, avoiding C++'s bloat and inconsistency.

Cross-Platform: Rust runs everywhere Meta's C code did (Windows, Android, iOS, Linux), overcoming initial platform kinks. Cross-Platform: Rust runs everywhere Meta's C code did (Windows, Android, iOS, Linux), overcoming initial platform kinks. AI mode in Google SERP

Reliable Debugging: Debugging works seamlessly across C/Rust boundaries: breakpoints, stack traces, variable inspection all reliable. Reliable Debugging: Debugging works seamlessly across C/Rust boundaries: breakpoints, stack traces, variable inspection all reliable.

For customers, it means less jumping between apps and more convenient service in one place.

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