Does Google Hangouts only work with Gmail?

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Tags

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2. #hangouts
3. #introducing
4. #allow
5. #which
6. #google
7. #guest
8. #session
9. #gmail
10. #complaints
11. #answered
12. #hosts
13. #could
14. #those
15. #accounts
16. #invite
17. #video
18. #conferencing
19. #users
20. #anyone
21. #today
22. #complained