So to answer that question, if you block someone on Facebook Messenger, the person won’t be able to see stuff you sent them that is if you can still message them.
Because blocking on Facebook Messenger and Facebook chat is a two-way stuff. The person that blocks and the one that was blocked won’t be able to contact each other except the blocker unblocks. And mind you that when you unblock someone on Messenger or Facebook, you need to send them a brand-new friend request before they can start interacting with you automatically. See: How do I turn Instant Replies on or off for messages to my Page?
Unblocking on Facebook Messenger is very simple. Let’s consider the steps one need to block and unblock people on Facebook.
The point is if you have a lot of friends, there is every tendency that you must block some from time to time. The reason is that not all your Facebook or Messenger friends are true friends. Some are just there to spam you while others are just there to spy on stuff you post or share with your friends.
So believe you me that there is no way when you discover that you won’t look for the means to safeguard yourself.
And most times the best way to secure your account is to block them. Facebook, by the way, recommends you block those friends you feel don’t worth your friendship. So if you block people on Facebook Messenger, don’t worry about it because they won’t be notified.
Facebook takes the privacy of its users seriously and blocking on Facebook Messenger or Facebook itself is a private stuff and Facebook can’t just expose that.
How to Block People On Facebook Messenger: On Browser
To block people on Facebook Messenger, do this;
1. Open your Messenger app
2. Navigate to the profile of the person you wish to block from accessing your profile
3. Click to open a conversation with the person
4. Click the gear button that is next to their name at the right corner of the page
5. Select Block Message
See: View Blocked List On Facebook Messenger | How do I unblock someone in Messenger?
To block messages from someone: iPhone and iPad
1. Open a conversation with the person you want to block.
2. Tap their name at the top of the conversation.
3. Scroll down and tap Block.
4. Tap next to Block Messages.
To block messages from someone: Android:
1. Open the conversation with the person you want to block.
2. Tap the circular icon with small i-dot within, scroll down, and then tap Block.
3. Tap Block all messages.
How to Unblock People on Facebook Messenger
When you settle your differences with people you’ve blocked on Messenger, you can choose to unblock them on Facebook Messenger. Unblocking is the reverse of blocking. When you unblock people, they can then be able to access your account as before.
However, when you unblock people on Messenger, you’ll need to send them a fresh friend request.
The reason is that Facebook does not automatically reconnect you with the people you unblock. Facebook recommends you send them friend request which they have to accept before you can then be able to see stuff they do and they too can see stuff you do. See: How can People order Food from my Restaurant Through my Facebook Page?
To unblock people on Facebook Messenger, do the following;
iPhone and iPad:
1. Open your Facebook Messenger
2. From Home, tap your profile picture in the top left corner.
3. Tap People and then tap Blocked.
4. Tap the name of the person you want to unblock.
5. Tap next to Block Messages to unblock them.
Android:
1. Form Home, tap your profile picture in the top right corner.
2. Scroll down and tap People.
3. Tap Blocked people.
4. Tap Unblock next to the name of the person you want to unblock.