Many long-term Facebook users simply prefer the old design. The blue header bar, the simpler icons, and the straightforward navigation drawer (swipe from left) are intuitive and fast. There are no hidden menus or confusing iconography.
Permission model changed in Android Marshmallow. Version 5.1.1 doesn't know how to request permissions properly. Fix: Go to Settings > Apps > Facebook > Permissions. Manually grant Storage and Contacts (if needed) before opening the app. Facebook Apk 5.1 1 Download
The is a time capsule. It offers a blazing-fast, ad-lite, story-free experience that modern users desperately crave. However, it is a ticking time bomb regarding security and API compatibility. Many long-term Facebook users simply prefer the old design