Like it or not, Facebook may still know your secrets
Users can opt out of seeing specific brand advertisements on their page, and they can opt out of receiving any targeted messages by visiting each third-party data partner's website.
That is a somewhat complicated process, though, which has prompted the Electronic Frontier Foundation to issue step-by-step instructions. The foundation suggests that consumers who want to avoid ubiquitous tracking install tools to block web trackers and be mindful about sharing their email addresses with marketers. Facebook declined to provide data on how often users opt out of seeing ads.