I have never posted on CC from work.
Years ago, when I ran a couple large body shops, I did post on a couple of industry forums at work, and often I would find that would tie up my time that I should of been using elsewhere. But many nights, I was stuck at work, "waiting for paint to dry" so I could turn off the paint booth and go home...or I would end up sleeping in the office chair. The good news is, I don't have to work crazy hours like that. The bad news is, I miss the extra $$$.