Currently, Facebook tracks its users through cookies and social plugins across sites.
By providing better and more relevant ads, the company believes that it will help both users and advertisers.
Previously, only Facebook users who visited these apps or sites saw the ads.
This is almost the exact same cookie-based implementation that other companies, like Google, are using.
Our buttons and plugins send over basic information about users browsing sessions.
For non-Facebook members, previously we didnt use it.
No matter what, Facebook will find you, whether you have profile or not.
source: www.techworm.net
