Question: I open the Facebook app on my phone and go to chat and it tells me one person was last active ten minutes ago and then all of a sudden it says last active one minute ago but I never see a green dot to say they were online. Why is this? It shows green dots for others but not this one person. It was happening throughout the night but then stopped at a certain time.

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I only ask this because I have an anxiety along with other things and it plays on me at times. I just wondered is it a flaw with Facebook or something I should be concerned about. Any help would be greatly appreciated.

Answer: 
Maybe you can no longer see they became friends because now he/she can only see their friends or ungrounded that person
If they have chat off (but they are online), it will keep reporting 1 minute ago until they log off.