In the quest to increase advertising revenue, Facebook started testing a feature called “real-time offer”, which allows advertisers to place the brand on parts of the social network during specific times, according to the The New York Times.
The social network has also developed a system that uses the user’s browser cookies to display advertisements based on their internet habits. Thus, a user who often visits many travel sites, for example, may see advertisements on the social network related to airline tickets, or places to visit.
Facebook guarantees that it will not share the information collected from users with advertisers, and that it is possible to disable tracking after leaving the site in the privacy settings.
Facebook Online advertising