I gave up on the official app long time ago. It was unusable on my 830 (freezes!!) and just poor ok my 1520...
I tried ok just accessing FB purely on Edge for several month. It doesn't have all the bells and whistles but it doesn't freeze or crash. I also did use Web Titles to pin FB to the start screen...
But lately, I moved on to Slim Social for FB. It's basically a wrapper but does have a black theme. Works well, for lite FB users...
...!!