Well, you may have better luck on the main board since you're looking for a Broadway person and there's a much larger volume of people who view that board and not this one. If you focus on what show your friend was doing or might be doing now, and less on just wanting to get in touch with him, it's technically on-topic, right?
I can't think of any other sites. Google didn't pull up anything. Did you run his name through IBDB? I don't know what else to suggest, but hopefully you may understand why people who may know him or what he's doing may be leery about giving you specifics.
"It's not always about you!!!" (But if you think I'm referring to you anyway, then I probably am.)
"Good luck returning my ass!" - Wilhemina Slater
"This is my breakfast, lunch and f***ing dinner right here. I'm not even f***in' joking." - Colin Farrell