If you want to access a friend's hidden information, there are a couple of things you can do. First, you can open up the mobile version of Facebook on a desktop computer. But, this method doesn't work for everyone. You can use a web browser like Chrome and force it to behave like a mobile device. This should force Facebook to display the mobile version of the Facebook Marketplace.
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If you have a suspicion of someone using a fake Facebook account, you can trace their IP address to find out who is behind it. Facebook shares your IP address with law enforcement agencies when they investigate suspicious activity. However, you will need to get a court order to trace their IP address and billing address.
If you don't want your friends to share your posts on Facebook, you can disable the share button on your posts. To disable the button, simply log into your Facebook account and click on the gear icon in the top right corner of your screen. Once you're in the settings page, click on Privacy and Security. Then, click on Edit post privacy. This will make your posts private to all but friends.
To unlink Facebook from Call of Duty mobile, first log in to your Facebook account. Then, navigate to Settings>Linked Accounts>Unlink Account. You must click "Unlink" if you wish to keep your in-game inventory. Alternatively, you can use the Facebook app to unlink your account.