Is there any way to block all non-friends on facebook?
Well, I know of a profile which can't be viewed by any non-friends at all? Why is it behaving that way? Is it because it is about to deleted by facebook?
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Ah, ok. AFAIK, the only way to make a page show "Page not found" is to deactivate the account entirely. Check out the Help article on how to deactivate your account: https://www.facebook.com/help/359046244166395/
Watch out - this will remove the access to someone's profile for EVERYONE, not just non-friends. If you are looking to block ONLY non-friends, then controlling your privacy settings is a much better idea. Deactivating it will prevent the page from showing up on both friended and non-friended people.
You can deactivate/reactivate your Facebook profile whenever you like:
I deactivated my account. How do I reactivate it?
If you've deactivated your account, you can reactivate it at any time simply by logging in with your login email address and password. If you don't remember your password, you can reset it here. If you can't remember which email address you use to log in to Facebook, click here. If you have other problems logging in to your account, please review the frequently asked questions listed in the Login and Password section of the Help Center.
Tip: If your account has been disabled for security reasons or due to a violation of Facebook’s Statement of Rights and Responsibilities, you may need to contact us to regain access to your account.
I'm not sure what you're asking here, but if it is related to Facebook's Privacy settings, you can read more about it here: https://www.facebook.com/help/privacy
Check out the "Controlling Who Can Find You" section. It provides options on turning on (or off) the ability for non-friends to find and/or message you on Facebook.
By default, your privacy settings allow everyone to find you with search and friend finder using the contact info you have provided, such as your email address and phone number.
If you’d like to modify who can look you up using your email address or phone number: Click the account menu at the top right of any Facebook page and choose Privacy Settings Next to the How You Connect heading, click Edit Settings Select your preference from the dropdown menu next to Who can look you up using the email address or phone number you provided?