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By Dan Ming

Facebook executives often talk about their mission as “bringing the world closer together.” With more than 2 billion users, it’s true that the platform does connect people. But one thing CEO Mark Zuckerberg’s congressional testimony highlighted is that simply connecting people is not how Facebook reached a market cap of nearly $500 billion.

At its core, Facebook is an advertising company. In 2017, 98 percent of its $40 billion in revenue came from advertising. It’s not your data that Facebook is selling; it’s your attention.

Facebook’s ad platform translates your clicks and posts into “user attributes,” and places you in certain categories for advertisers. For example, your activity could suggest that you recently had a child, that you’re a Bernie Sanders fan, or that you have an “affinity” for certain racial groups.

One of the most powerful features, “Custom Audiences,” allows an advertiser to target individuals based on offline information such as email address and phone number. An advertiser can upload that data to Facebook, which will match it with its user base to find who that information belongs to. Then there are so-called “dark posts,” a feature Facebook is now changing, which only show up in the news feeds of specific audiences and are completely hidden to everyone else.

Full disclosure: VICE News (along with almost every other major news organization) uses some of these advertising tools.

The tools can be used by anyone who wants to advertise on Facebook, and critics say that’s an open invitation to malicious actors. Watch this video to learn more about how Facebook’s ad targeting works, and why it’s so effective.

Gabriel Connelly and Michael Shade contributed to this report.

By Dan Ming

Sourced from VICE News