On: Tim O'Reilly: The Biggest Ponzi Scheme of Them All

[justindz]

A Ponzi scheme is where new investors pay returns to existing investors, but there is no actual trade made using the income.

EDIT: Oops. Explained adsense. Too much multi-tasking. Irrelevant anyway, since PageRank does not have any of the above characteristics.

Per prior comments, everything is not suddenly a Ponzi scheme.