I vaguely remember having such an issue years ago.
What’s the path exactly on the phone? Seems like the items are located under the Download directory. If so you should have full freedom to remove the items.
I have never seen a Download/AppLounge/ directory on my devices so I’m confused as to the actual path.
If you have Facebook installed, uninstall it. Use Frost instead.
Frost for Facebook (A fast and extensive third party wrapper for Facebook.)