Eyeball icon on _SOME_ USENET threads that I've replied to.

[Richard Owlett]

I am using
Mozilla/5.0 (X11; Linux i686; rv:52.0) Gecko/20100101 Firefox/52.0 
SeaMonkey/2.49.4
Build identifier: 20180711182954
Some, *NOT ALL*, USENET threads that I've contributed to have an 
"eyeball icon" in the leftmost column of pane containing subject titles.


WHY?   ????????

TIA

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