Facebook is now using its Like button and similar plugins to track everyone on the internet, including those who do not have an account with the social networking website. The social media site claims its new policy will help deliver better ads of a higher standard to web users everywhere. Facebook recommends that non-users opt out of receiving ads by visiting the Digital Advertising Alliance website or by clicking on the AdChoices icon next to an Audience Network ad. Facebook users can update their settings to stop seeing targeted ads, but that means theyll just see random advertisements instead.”]
Source: https://grahamcluley.com/facebook-using-ads-track-including-non-users/