This is more a curiosity than a pressing question (even though I tagged it as "bug").  But I noticed that my account "tags" seem to change over time.  I figured some algorithm looked at my questions and answers and somehow decided to tag what it thought my specialties to be, accordingly.  Then, today, I noticed my tags as "greek", "fonts" and "siunitx".

Now I can understand "greek" as a tag, since an old answer of mine recently received some attention concerning upright greek symbols.  Fonts?  OK, I'll buy that one too, though it is a bit of a stretch.  But "siunitx"???!  I am embarassed to admit it, but I've never even voluntarily loaded the package (except if the OP's preamble does).  Five hours ago, I left a comment on http://tex.stackexchange.com/questions/237083/getting-instead-of-comparison-sign-in-cases that mentioned the word "siunitx".  The comment got 3 upvotes.  

Is that apparently enough to tag me as... what?  Proficient in "siunitx"?  If that is all it takes to tag a user, I had misplaced faith in the tagging algorithm.