Past versions of similar modded apps (Facebook Lite Plus, FB Creator) have been caught sending user data to Chinese and Russian servers without consent.
If you cannot access official stores, these platforms are commonly used for verified APK downloads: Facebook Lite - Apps on Google Play Facebook Gb Apk Download -UPD-
Instead, combine the official Facebook app with trusted utility apps for downloading or theming. Your privacy and security are worth more than a few convenience tweaks. Past versions of similar modded apps (Facebook Lite