Do you need Gmail for Hangouts?

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Tags

1. #participate
2. #hangout
3. #external
4. #guests
5. #available
6. #account
7. #features
8. #allowed
9. #google
10. #present
11. #other
12. #meeting
13. #mobile
14. #device
15. #without
16. #users
17. #using
18. #hangouts
19. #video