What does the green circle with white dot mean on LinkedIn?

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Tags

1. #their
2. #middle
3. #messaging
4. #white
5. #green
6. #circle
7. #quietly
8. #connection
9. #means
10. #mobile
11. #active
12. #there
13. #month
14. #available
15. #linkedin
16. #online
17. #status
18. #connections
19. #introduced