Too many topics, too little time

Vint Cerf: one quarter of all computers part of a botnet:
Cerf told his listeners that approximately 600 million computers are connected to the Internet, and that 150 million of them might be participants in a botnet—nearly all of them unwilling victims. Weber remarks that “in most cases the owners of these computers have not the slightest idea what their little beige friend in the study is up to.”

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I think it is actually quite likely that this is a higher number than that having experienced dealing with this at several institutions.