Frost is not a true app; it is a web wrapper for the Facebook mobile site. However, it adds a native Android feel, including chat heads and notification integration. Since it uses the mobile web version, Meta still keeps it functional on older browsers. You can find Frost on F-Droid (the open-source app store).
If you have a cherished device like a Nexus 5 or a Galaxy Tab 3 that you use as a backup phone or media player, installing is a great way to stay in touch without buying new hardware. Text messaging, group chats, and voice calls work surprisingly well. facebook messenger for android 4.4.2