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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.
"experienced programmers" in would have web developers fall under that umbrella, I'd guess web developers are less likely to adopt adblockers if their livelihood depends on them
experienced just means they've been doing it for some time, it says nothing about how well they do it.
Hence the quotations ;)