Online Tracking Firm: Kazaa Losing Users (AP) AP - Kazaa's long-standing position as the most popular online file-sharing software appears to be over. Last month, the daily average of file-swappers on the FastTrack peer-to-peer network, which includes Kazaa and related programs, was surpassed for the first time by users on the eDonkey/Overnet network, according to online tracking firm BayTSP Inc.