After Facebook forcibly split messaging into the separate Messenger app around 2014-2016, older Facebook APKs that still had built-in chat will eventually break. You’ll see “Chat is no longer available in this version.”
In conclusion, the search for "Facebook old version APK" highlights a fundamental tension in the modern software industry. It signals a dissatisfaction with the resource-heavy nature of contemporary apps and the planned obsolescence of hardware. While downloading an older version offers a temporary solution to storage constraints and data limits, it exposes users to severe security vulnerabilities and an unstable user experience. Ultimately, the popularity of old APKs serves as a critique of modern app development, suggesting that for many, the pursuit of "new and improved" has come at the cost of efficiency and accessibility.
: If a phone is running an older Android OS, the latest Facebook app may not be supported at all. How to Safely Find and Install an Older Version