Only now have we had a definitive reply regarding the legitimacy of certain parties to this ARG.
Reliable Sources at this point in time are:
The standard twitter search function for this following is #lostarg
Debunked / False Sources / Non Relevant:
http://study.lb-dg.com/Welcome.html (password: nelsonification )
PLEASE be especially aware of the lb-dg one, it asks you to send off a questionnaire with money.
Two of the other links are plugs to a NON-ARG book.
lostpedia blog seems to agree, see: LINK
I also propose a motion to remove threads pertaining to false sources/ information to avoid confusion