Stupid is as stupid does. Why do people Stalk, Troll, or Lurk. And are all three the same?

Having disqus Pro  and my Ukranianan Software does have it's advantages.  Like when it told me who lurks, trolls, or stalks on our channels. Now here's a screenshot of me and one of the channel lurkers.

Now if you look closely, I have 2,909 engagements.  But the person below me has no comments.  Why come here over 1,000 times but make no comments?  I guess the articles here must be that good.  Rumor has it that multiple IP addresses also show up.  Now this is just one channel and one person.  What is this person looking for?  We have found multiple folks and their socks who lurk.  Also many of our friends who come to just read our articles and give up votes.

The stalkers are quickly shown the door. The troll is harmless and the lurker is usually your down voter.  What say you?