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Online Ads Can Infect Your Device with Spyware
(www.scientificamerican.com)
This is a most excellent place for technology news and articles.
I think I heard that usage on desktop is something like 1 in 4, which is pretty good. Mobile is another world altogether, since it requires different browsers that support adblocking and then accessing websites through the browser instead of the app for the website, which many users would definitely prefer to use.