An additional thought about dumping all Zango users, and it ties in with a comment I made about how sponsors should only red flag sales showing the user_agent and then investigate the referring URLs.
The surfer can still buy a membership, and the right WM would still get credit: If the link/keyword has not been sold by Zango.
As far as the low number of surfers being detected, remember that a lot of these installs where done for other reasons than porn, like games/musics/etc. So a lot of the infected computers may never hit a porn site.
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