Originally Posted by bgolat
i have seen them a couple time, i think they are last resort if google cant find keywords to display ads for or something.
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yep.. exactly
if google cant find any good keywords on your site to refer to advertisements, they will put up 'PUBLIC SERVICE ADS' which dont give you any $.. they are usually ads for charities and stuff like that
it will say 'public service ads by google' on the advertisement