How to block another user or page?

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Is there a Facebook user bothering you, annoying you, or someone you simply don't want to see your profile? In the "Blocks" section, you can block them. This means that they'll no longer be able to see what you post on your timeline, tag you, invite you to events or groups, start a conversation with you, or add you as a friend. You can also create lists of people with restricted access, so they can only see certain posts. You can also block Pages that you don't want to comment on your posts, for example.

What apps have you linked to Facebook?
The "Applications" section lists all the apps you've consciously buy bulk sms service or unconsciously linked to your Facebook profile. Sometimes we unconsciously grant access to our Facebook profile to apps in order to access a service or online tool (often, the access authorization is deliberate). This linking can lead to security issues if the linked app is compromised. Therefore, it's a good idea to occasionally go to the "Applications" section of your profile's "Settings" and delete any posts you no longer use or don't want to keep linked.

How to prevent strangers from accessing your Facebook account?
Have you ever received an email warning you that someone is trying to access your profile (and it's not you?)? Change your profile password immediately in the "Security and Login" section. Do you want to receive an alert message when someone tries to access your profile from a device other than the one you normally use (be it a computer, tablet, or mobile phone)? You can do so in this section. You can also enable two-factor authentication, so that accessing your Facebook account from an unknown device requires not only your password but also the code sent to your mobile phone.