Advice Sought

This entry is locked down pretty tightly, because it's about someone we all know. I hereby ask you NOT to relay any of this to . If you can't agree to that, please read no further.
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So, here's the thing. I'm tickled to death that he came to work for us. He's doing a great job for the most part, and I know it's really frustrating and boring sometimes, but it won't be forever. Really.

However, there are two issues I need to talk to him about, that I'm not sure how to approach.

The first is that he needs to spend less time playing on the net during work hours, and more time working. Yes, I know he sometimes doesn't have huge amounts of work, but even when there's not a lot on his desk, there's stuff people would happily hand off to him. The guys in my office, however, don't know how to say, “Yo, Jeremy, stop playing and help with this.”

The second is that his moodiness is coming across as meanness to the boys, and I need to gently tell him to tone it down. We all have moods, we all get frustrated by stuff, but we're all stressed enough without dramatics. I'm fairly certain he doesn't MEAN to give that impression, but he's not yet familiar enough that the guys can tell when he's being facetious or not.

On another note, one of the guys we both work with told me that the rest of them wouldn't tell me this, because they're afraid of me. So I have to deal with that, despite my amusement that anyone could be afraid of…me.

*Please* help?