Does Judaism allow placebos where the person thinks it does something, and is thereby cured, even though the item does nothing? Is this gnevas da'as (or some other issur), or because it can help them ...
Contextual ads are those ads you see when you do a search on Google. The advertisers only pay if someone actually clicks on their ad. It seems "pashut" to me that clicking an ad if you know you're not ...