Facebook knows a lot about everyone that's why it's one of the biggest advertising platforms. Facebook tracks users across the Internet through the online activity of users that other websites and apps share with Facebook . Everything we do online, from buying shoes and clothes to looking for products we like, generates a huge amount of behavioral data. And websites and apps often share these behavioral data with too many advertising companies, allowing them to build accurate profiles of your needs and interests. After facing worldwide criticism over the data breach and privacy controversies, last summer Facebook announced a privacy-focused tool, named Off-Facebook Activity , which gives every user of Facebook more control and transparency of their data collected by Facebook. At first, the Off-Facebook Activity feature was available to users in selected geographies for testing and now, the Off-Facebook Activity feature is available to all users worldwide.