This morning, I noticed an unusual number of complaints in the help forums with complaints that their hacked-free sites were labeled by Google as “this site may be hacked.” The label is just under the click-able link in the Google search results, which would make any searcher wary about visiting the site.
Here is a screen shot of one of the many examples of sites misclassified:
We’re slowly rolling out a new hacked page classifier (not CMS specific) and noticed a small number of misclassifications. We’re sorry for any trouble this may have caused — we are working on addressing the issues.
Those who have this warning listed on their web site in Google has nothing to do but wait until Google fixes the issue. During that time, one would expect the click-through rate on the search listing would drop heavily.