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by sandycheeks 4696 days ago
The problem is not just malicious ads.

About 3 years ago I had Chitika ads on a busy website and one day they ran a test of their new mobile ads and accidentally turned it on for all advertisers. As a result all of the pages that had the Chitika javascript code on them displayed a huge ad that took up the bottom third of the viewport. It only lasted a couple of hours but I had over 5k uniques see it and have been extremely parsimonious with what third party javascript I put on sites ever since.