How can you tell if someone is online?

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Tags

1. #image
2. #moment
3. #field
4. #right
5. #person
6. #toward
7. #doesn
8. #present
9. #green
10. #typing
11. #friend
12. #bottom
13. #online
14. #click
15. #check
16. #start
17. #profile
18. #search