What is if you send a message on facebook then block them?

If you send a message on Facebook and then immediately block the person, they will no longer be able to see the message or your profile. The message will no longer appear in their inbox and they will not receive any push notifications about it. Blocking someone also means that they cannot find your profile or contact you in any way, so it’s an effective way to cut off communication with someone if you no longer want to talk to them. However, it’s worth noting that if the person has already seen your message before you blocked them, they may still be able to remember the content and could potentially share it with others. Therefore, it’s always a good idea to think carefully before sending any sensitive or private information on social media.