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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.
Closing the tab and moving on with life is what I do when a Twitter login prompt or paywall appears. I've often thought it would be better for me to unblock ads, at least on timewasting sites like Youtube, just so that I get pissed off by the ads and close the tab, making it easier to stop wasting time.