I know many of us frequently visit FJM (www.firejoemorgan.com) and after almost 3 years they have revealed their true identities.
http://www.firejoemorgan.com/2008/02/era-of-anonymity-comes-to-end.html
It turns out that they are all Hollywood writers. Ken Tremendous is a writer/producer on The Office (Also playing the part of Dwight's cousin Mose). Junior is a consultant for South Park and dak has written for Crank Yankers and The Frank Caliendo Show. Pretty crazy, I figured it was worth sharing. No wonder posts have been up, they must be pretty bored.