A week ago, Google had a bug with the AdSense contextual targeting engine which generated PSAs for all ads for a five minute period. PSAs, again, are public service ads that are shown when no ad match is found – so Google shows a free ad for a non-profit organization.

This time, the issue seemed to be at least four hours, but maybe longer. First reports came in sometime last night, probably late last night. The earliest time stamped complaint I saw about this was at DigitalPoint Forums at 12:20 this morning. Things began targeting properly again at about 4:30 this morning.

Google has yet to confirm the issue but clearly there was some wide spread issue with this contextual targeting.

Forum discussion at DigitalPoint Forums, WebmasterWorld and Google AdSense Help Forums.

Update: Google posted a blog post with the confirmation of the issue, they said: