Thread tags

[Empty_of_Clouds]

In the list of threads, at the right side of the thread title there is often a paperclip symbol for an attachment, and sometimes a kind of tag symbol which when hovered over reveals tag words for the thread. What I want to know is how these tags are generated and who puts them there. I've notice a few derogatory ones on my threads and other peoples threads, and I know I never added these as keywords.

So, who does this?

note:

On my "First pen show" thread the tags are "budget travel" and "first time in US". Neither of which are true, though benign enough.

On my "Not a hobbyist" thread I get "eeyore", "faux adieu" and "trolling for sympathy". None of these are remotely connected to that thread, so my guess is they are deliberate insults from anonymous cowards.