When I worked at Superstore, I pretty much added everyone I worked with in electronics. Some people added me, including my first supervisor. It's not like I put anything personal on Facebook, so I don't care what they see.
On the topic of Facebook, I don't understand why some people feel the need to put how their feeling as their status. I don't care if you're feeling depressed, I don't care if you're pissed off at the world, and could go on a killing spree.
I got someone mad at me one time when I commented on their status about being pissed off at whatever. I asked them if they figured if anyone really cared, lol.