http://news.ycombinator.com/threads?id=marketer
This is merely a naive guess. He's the only other user on hacker news (according to Google) to use the term "people search engines". He also seems to have been working in the data mining business.
He also seems to comment heavily on technical issues - programming languages, database technologies, so it might make sense for him to feel heavy non-tech opinions deserve a onetimetoken. Similarly reasoned, the sentiment of "privacy is dead, there is only identity management" seems to be a realization appropriate for someone who recently started working on YC-funded companies. Seem convincing to me, but since they're all reverse-justifications, probably best to take them with a grain of salt: you might be able to draw similar conclusions combing through many other comment histories.
Interesting that this "human [powered] search engine" style of identification might have been faster than devising a machine heuristic.
"...his brother recognized Ted's style of writing and beliefs from the manifesto, and tipped off the FBI." from http://en.wikipedia.org/wiki/Theodore_Kaczynski
Edit: ok one other thing strikes me: use of the word "ton" doesn't quite fit with the rest of the language.
I am concerned with online privacy, but not to the extent as "onetimetoken" (my FB profile is globally viewable). Also my comments are usually short, and I avoid big generalizations.
Looking at the thread in question, though, I'd definitely guess jgrahamc.