I had end-to-end security on the Facebook messensger about ten years ago when I was able to connect with Pidgin (iirc) and use the OTR plugin. That end-to-end

I had end-to-end security on the Facebook messensger about ten years ago when I was able to connect with Pidgin (iirc) and use the OTR plugin. That end-to-end security also didn't rely on Facebook. Not sure how this could work nowadays, I have closed my facebook profile many years ago.