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Sorry that you're having trouble directly sending images from Lightroom to Facebook. I am not quite getting the ability you've mentioned is missing. Are you getting any error message? Also, which exact version of Lightroom are you using?
There is an ongoing issue publishing to Facebook as mentioned here: Facebook authentication check failed
Google translation of the error message: It's no longer possible to share Facebook with computer programs
From 1 augusb 2018, it is no longer possible to use programs like Lightroom Classic CC to publish photos to your bd line.
You will still be able to add to your published Facebook collections. Create a copy of the collections in your personal database. For more information, take a look at the suggested temporary solution on
www. adobe. com / go / facebook-sharing error_se.
The article provided by Akash explains why publishing to Facebook from LR desktop (all versions) no longer works, and it lists a couple of workarounds.