Well... I think it's a mixed bag, so to speak. People can & do sometimes become friends with co-workers & supervisors. And sometimes it works out. But other times I do think it can become a problem too. Part of the difficulty is there's no way to know what unexpected turns of events may arise as time passes. What may seem perfectly innocent & appropriate at first, could unexpectedly turn into a problem later on. I suppose, to some extent, it perhaps depends on the type of work a person does? I'm no longer working. However back when I was I was never friends with anyone I worked with. But then I was never really friends with anyone. So I suppose the one was simply an extension of the other.