Question about facebook friend list?

[Rachel L]

There is a facebook user who is not on my friend list. I can't reply to any of our chat conversations however I am able to still view their comments on my posts. The link won't work when I click their name. I know it's a possibility that I was blocked, however from my experience when someone blocks me I can't even see their previous comments on my posts. I can't search for them in the search box either. Is there another possible reason why they could not be on my friend list other than them blocking me?

[eris9228]

they have deactivated their facebook account.

[?]

They could be following you. Or your privacy settings are very open to others.

[Pravallika]

maybe the coversation has been muted or the account may have been deactivated.