On a PC, search for: "Facebook 1.1.0.17 Windows Mobile 6.1 CAB" (Use archive sites like FreewarePocketPC or XDA Developers).
: Modern security protocols (TLS 1.2/1.3) used by Facebook today are not supported by the built-in internet stacks of Windows Mobile 6.1, causing connection errors.
This was Windows Mobile 6.1. And if you wanted to “poke” your friends on the go, you needed one specific file: Facebook for Windows Mobile.
If you are trying to get an old device back online for a , I can help you look for: