Do you have to add someone on Messenger to message them?

Related questions

1. What's the difference between a DM and a PM?
2. What pm means in chat?
3. What is PM on Facebook?
4. What is a DM Group?
5. Is there a space before PM?
6. Does midnight start or end of day?
7. Does midnight mean the next day?
8. What is the correct way to write PM?
9. What is the biggest time difference?
10. What day does midnight belong to?

Tags

1. #requests
2. #contact
3. #friends
4. #already
5. #people
6. #choose
7. #message
8. #social
9. #giant
10. #person
11. #messenger
12. #allow
13. #users
14. #facebook
15. #prompt