Facebook is now common every where. All website also consider and give importance to facebook, So there is no restriction in office also. I do used
We work on building facebook applications , so no reason for it to be blocked. And one of the best marketing and networking sites - people visit majorly from mobiles as well. How much will you block ?
I use facebook while at work all the time. I work 12 hour shifts, sometimes until 3am....I am usually bored by 1am and I am not very busy at that time.....
Face book is blocked in my work place. so i cant even do promotion work through face book. we are missing good links via face book.