To help advertisers measure the effectiveness of their ads on Pinterest, we may share information about your activity on Pinterest with them.
For example, an advertiser can place html code on their website to read the Pinterest cookie stored in your browser (this code is called a "pixel" or "tag"). If you make a purchase on the advertiser’s website, the tag sends that information and your cookie to Pinterest. We’ll use that information to tell the advertiser how many purchases resulted from their ads shown on Pinterest. If the advertiser also passes us a transaction number that identifies your purchase, we may give them information about the ads you saw before that purchase, but you can change this at any time by adjusting your account settings.