"Don't know what "DU" is."
Not all liberals are trolls, but all trolls ARE liberals. See here for some background on trolls and ZOT.
As for the DU, think of a bunch of inbred crosses between Howard Dean and Dennis Kucinich on steroids and out of medication.
IF you decide to take a look over at DU, PLEASE don't let any kids see. LOTS of profanity.