I know how much you guys wanted this so here is Noh Byung Joon's Facebook. http://www.facebook.com/byungjun22
Park JongWoo has a twitter (@qkrwhddn10). I'm pretty sure this is real. His followers include JDW, NTH, Jang Hyunsoo, KYK, Yun Illok. Also, KimChangSoo's twitter: @tjaksejr27
qkrwhddn10 = 박종우10. Those are the letters on an English keyboard that correspond to a Korean keyboard. q =ㅂ, k = ㅏ, and so on.
I doubt KSS took them seriously. I'm not aware of any death threats in Korea that turned out to be real.