To block someone on Facebook, you can follow these steps depending on whether you are using a desktop or mobile device:

On Desktop (Facebook Website)

1. Go to your Facebook profile.
2. Click the down arrow at the top right corner.
3. Select Settings & Privacy, then click Settings.
4. In the left menu, click Privacy , then select Blocking.
5. In the Block users section, type the name of the person you want to block.
6. Select the person from the list and click Block.
7. Confirm by clicking Block again.

Alternatively, you can block directly from the person's profile:

1. Visit the person's Facebook profile.
2. Click the three horizontal dots near the top right.
3. Select Block.
4. Confirm by clicking Confirm

On Mobile (Facebook App or Mobile Website)

1. Search for the person's profile.
2. Tap the three horizontal dots next to the Message button.
3. Tap Block.
4. Confirm by tapping Block again

What Blocking Does

• The blocked person cannot see your posts, tag you, invite you to events or groups, send you messages, or add you as a friend.
• Blocking is profile-specific; if you have multiple Facebook profiles, you need to block the person on each separately.
• The person will not be notified that they have been blocked

Blocking someone is reversible if you change your mind later, but you cannot block the same person again within 48 hours after unblocking

. This process helps you prevent unwanted interactions and maintain your privacy on Facebook