What is the main purpose of WhatsApp?

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Tags

1. #blackberry
2. #users
3. #popular
4. #iphone
5. #messages
6. #windows
7. #unlimited
8. #android
9. #cross
10. #messenger
11. #messaging
12. #platform
13. #exchange
14. #nokia
15. #allows
16. #application
17. #especially
18. #video
19. #audio
20. #instant
21. #smartphone
22. #phone
23. #whatsapp
24. #image