Despite years of user complaints, OEMs continue to install third-party apps on brand-new devices. Even in 21018 you will still find many phones with pre-installed Facebook. What's worse, it's installed as a system app so it can not normally be uninstalled without root access. However, there are some workarounds.
Mainly due to the recent Facebook data scandal, OEMs need to pre-install these apps, which unnecessarily waste memory and resources. Apps should be selected, not forced upon you. Being a system app, removal is much harder – but not impossible.
As every OEM Bloatware system app varies, we have three methods to help you remove Facebook and other system apps. We listed them in order of difficulty, from the simplest to the most complex. None of these methods will uninstall the app. Instead, they're turned off, which prevents background activity or new updates from being removed from the app tray. Mainly the app is put to rest instead of getting killed.
: Disable the App in Preferences
By far the easiest method is disabling the app in Preferences. To do this, open the app settings and select "Apps". For newer versions of Android, you may need to tap "All [x] Apps" to expand the list.
Select Facebook (or the system app you want to remove) to open the app info page. At the top of the page are two buttons: "Disable" and "Force Quit." Select "Disable" and click "OK" in the popup. If the Disable button is grayed out, try one of the following methods.
Method 2: Use a Package Disabler App  If the first method is not possible or if you need more than just Facebook, we recommend using a package deactivation app. These apps can not only remove Facebook but also many OEM OEM Bloatware apps
Currently, the only reliable apps are available only for LG and Samsung devices. The LG version costs $ 1.99 and the reliability varies. However, Samsung users should not have a problem, even if they use the new Galaxy S9 or S9 +. Similar to the LG version, this app is not free, with a price tag of $ 3.49.
Method 3: Use ADB Commands
The most difficult method is to use ADB commands Commands, but it's free and will definitely do the trick. But do not worry, ADB commands are more daunting than complicated, as the process of removing system applications is pretty straightforward.
The first thing you need is ADB installed and opened on your computer. Use the link below if you do not know how to achieve it.
For proper communication between your phone and the PC, you need to install USB drivers for Windows devices. Use this link to find your phone manufacturer and follow the instructions on how to get the correct drivers. For Mac and Linux users, you can skip this step.
Next, go to the Play Store on your phone and install the App Inspector. App Inspector gives you the exact package name of Facebook and any other system app you want to disable.
Open here App Inspector and select "App List", then tap the Facebook app. The package name is located under the name of the app, starting with "com" or "net" followed by a series of words separated by periods.
Connect now Your phone with your PC and enable USB debugging. Type the following command at the command prompt or in the terminal and replace XX with the package name you just found.
adb shell pm uninstall -k –user o XX
If done correctly, the message "Success," indicates that Facebook is disabled by your device. Note that this will not uninstall the app as it will be reset when you reset the device to factory defaults. If you have problems with Method 3, read the following link to learn how to reach the LG V30. Aside from the first two steps, you can follow any phone.