They already have, it's called Facebook Lite. You can't get it from the Play Store in the US, but I download an APK. It's nice. I only really downloaded it so

They already have, it's called Facebook Lite. You can't get it from the Play Store in the US, but I download an APK. It's nice. I only really downloaded it so that I could get notifications, and now m.facebook.com can send them from Chrome, so I'm very happy to totally app-less.