"Hit and run" posters / trolls

[TxDoc]

Hopefully you've figured out that newbies or minimal posters (lurkers) is not the same thing as a troll. A troll is specifically trying to rile up the regulars. It comes from fishing as in casting bait...trolling.
http://redwing.hutman.net/~mreed/war...tm/troller.htm

Thank you for the link - I was very confused about what a troll was, to the point that I googled it on another window before reading the rest of the posts...
But do trolls keep coming back, or they just give up and move on to create chaos in other online communities???