I sometimes do, but from my phone (on 3G, not on Wifi) because my job has the computers locked down to visit ONLY the website where we do our charting. We don't have any internet access beyond that.
During my shift, as long as my work is complete, I can watch tv, read, etc. as I choose, but I am still on alert and ready to jump into action of need be. Those are the times when I play with my phone, check facebook, play words with friends, look at the DIS, etc. This is especially true the nights I work third shift...the residents are asleep when I arrive and for the first 7 hours of my shift I simply have to be awake and alert and complete about one hours worth of housekeeping tasks. I do make up for it during the last three hours of the shift when things are very hectic, busy and demanding.