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Majority of Americans now use ad blockers
(www.theregister.com)
This is a most excellent place for technology news and articles.
The WoW forums around 2012 had a virus infect thousands of computers before blizzard removed it. It was a 3rd party ad that was spreading the virus.
I remember that, thousands of people got keyloggers and their accounts compromised. Then Blizzard tried to blame those people for getting infected, from the Blizzard website.