From a Google AdSense newsletter:
<<Changes in backup ad options
We frequently review our product and feature offerings to ensure they’re as effective as possible. Based on these reviews and on feedback from our non-profit partners, we have started to retire public service ads (PSAs) from AdSense sites so that we can focus our efforts on developing new opportunities for these partners. To read more click here.>>
Their link doesn't actually explain more http://www.google.com/adsense/support/bin/answer.py?hl=en&answer=48182&sourceid=aso&subid=ww-en-et-asblog_2011-1-31&medium=link |
I haven't seen a public service ad for several years now. They used to be everywhere, but I guess Google has so many paid ads now that they don't have a use for PSAs anymore. |
