I'm getting a new PC soon so I can play some ZS again after all these years!
Steam ID: STEAM_0:0:51930358
My proof is a screenshot from 2012 (top left hand corner): http://steamcommunity.com/sharedfiles/filedetails/?id=91460805
I used to be a super regular on the server like 2 years ago if that counts, I was forced to stop playing when Garry's mod just wouldn't run properly on my PC.