The persons won't know if you saw their messages, and you will also be able to block them.
Security: If someone not in your contact list sends you a message, the app will filter it and put it in a specific folder.
That's pretty convenient to know where another is or to schedule a meeting location.
Location sharing: You can pinpoint any point in the map or share your location in real-time with your friends for a limited amount of time.
Additionally, you will also be able to make messages ephemeral by setting up an expiration time.
Secret conversations: You will be able to have totally secret conversations, end-to-end encrypted, which means that only you and your recipient will be able to get access to the messages.
Just send them a link to your guests and start to talk with your family, friends, or co-workers.
Messenger Rooms: You can easily create virtual meetings of up to 50 people with no time limit, even if they don't have a Facebook account.