My fascination with the tribemen on the ground eventually led me to to this site:

http://savageminds.org/2008/07/01/are-there-uncontacted-tribes-the-short-answer-no/

As is typical on the internet, people are arguing about words instead of doing something proactive. More harm than good? I think not. Sounds like a little bit of professional jealousy and nitpicking if you ask me.