When you block messages from someone:They'll no longer be able to contact you (ex: send you messages, call you) in Messenger or in Facebook chat.You'll also no longer be able to contact them in Messenger or in Facebook chat.If you and the person you block are in a group conversation together, you'll be notified before you enter the conversation. If you choose to enter a group conversation with the person you blocked, you'll able to see their messages and they'll be able to see yours in that conversation.Learn more about how to block messages from someone.When you block messages from someone, it doesn't automatically block them on Facebook. Learn more about blocking people