How to know if someone is onlyn on fb?

[Abhishek]

Some people turn off chat and remain onlyn h.......

[Muahmmad]

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[Uday]

Here is the way i find out
1) If they like any pic or page it will come in to news feed
2)I always keep them in "close friend" category because it will give minute details about their activity
3)send some message and if they see it you will get notification"seen"

haha....so mostly people wil be caught even if they are offline

[Phanendra]

same