With the launch of the Z10, Q10, and Passport, BlackBerry introduced the BB10 operating system. This was a modern OS capable of running Android apps via a runtime environment. For a brief, shining moment, users could download the native Facebook app or sideload the Android version. But in 2016, Facebook officially announced it would discontinue support for its native apps on BlackBerry 10.
Some dedicated forums (like CrackBerry) provide links to older, "working" APK versions. If you attempt this: facebook download app for blackberry
Legacy devices lack modern security updates; avoid using them for sensitive transactions or private messaging if possible. With the launch of the Z10, Q10, and
The native Facebook app and the built-in browser on these devices are largely obsolete because they do not support modern security certificates (TLS 1.2/1.3). With the launch of the Z10