Facebook knows more about your personal life than you probably realize. As part of the company’s increasingly aggressive advertising operation, Facebook goes to great lengths to track you across the web. The company compiles a list of personal details about every user that includes major life events and general interests. For years, details have been murky about how exactly the social network targets ads—but the company has finally given us a glimpse into how the secret sauce is made.
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As The Washington Post points out, Facebook knows every time you visit a page with a “like” or “share” button. It also gives publishers a tool called Facebook Pixel that allows both parties to track visits from any Facebook user. It also works with companies like Epsilon and Acxiom who gather information from government records, warranties and surveys, and commercial sources (such as a magazine subscription lists) to learn more about Facebook users.
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If you’re curious about all the data points Facebook is using to target ads to you, here’s the full list:

    Location
    Age
    Generation
    Gender
    Language
    Education level
    Field of study
    School
    Ethnic affinity
    Income and net worth
    Home ownership and type
    Home value
    Property size
    Square footage of home
    Year home was built
    Household composition
    Users who have an anniversary within 30 days
    Users who are away from family or hometown
    Users who are friends with someone who has an anniversary, is newly married or engaged, recently moved, or has an upcoming birthday
    Users in long-distance relationships
    Users in new relationships
    Users who have new jobs
    Users who are newly engaged
    Users who are newly married
    Users who have recently moved
    Users who have birthdays soon
    Parents
    Expectant parents
    Mothers, divided by “type” (soccer, trendy, etc.)
    Users who are likely to engage in politics
    Conservatives and liberals
    Relationship status
    Employer
    Industry
    Job title
    Office type
    Interests
    Users who own motorcycles
    Users who plan to buy a car (and what kind/brand of car, and how soon)
    Users who bought auto parts or accessories recently
    Users who are likely to need auto parts or services
    Style and brand of car you drive
    Year car was bought
    Age of car
    How much money user is likely to spend on next car
    Where user is likely to buy next car
    How many employees your company has
    Users who own small businesses
    Users who work in management or are executives
    Users who have donated to charity (divided by type)
    Operating system
    Users who play canvas games
    Users who own a gaming console
    Users who have created a Facebook event
    Users who have used Facebook Payments
    Users who have spent more than average on Facebook Payments
    Users who administer a Facebook page
    Users who have recently uploaded photos to Facebook
    Internet browser
    Email service
    Early/late adopters of technology
    Expats (divided by what country they are from originally)
    Users who belong to a credit union, national bank or regional bank
    Users who investor (divided by investment type)
    Number of credit lines
    Users who are active credit card users
    Credit card type
    Users who have a debit card
    Users who carry a balance on their credit card
    Users who listen to the radio
    Preference in TV shows
    Users who use a mobile device (divided by what brand they use)
    Internet connection type
    Users who recently acquired a smartphone or tablet
    Users who access the Internet through a smartphone or tablet
    Users who use coupons
    Types of clothing user’s household buys
    Time of year user’s household shops most
    Users who are “heavy” buyers of beer, wine or spirits
    Users who buy groceries (and what kinds)
    Users who buy beauty products
    Users who buy allergy medications, cough/cold medications, pain relief products, and over-the-counter meds
    Users who spend money on household products
    Users who spend money on products for kids or pets, and what kinds of pets
    Users whose household makes more purchases than is average
    Users who tend to shop online (or off)
    Types of restaurants user eats at
    Kinds of stores user shops at
    Users who are “receptive” to offers from companies offering online auto insurance, higher education or mortgages, and prepaid debit cards/satellite TV
    Length of time user has lived in house
    Users who are likely to move soon
    Users who are interested in the Olympics, fall football, cricket or Ramadan
    Users who travel frequently, for work or pleasure
    Users who commute to work
    Types of vacations user tends to go on
    Users who recently returned from a trip
    Users who recently used a travel app
    Users who participate in a timeshare

Source: All of the Creepy Things Facebook Knows About You

I’d quite like to know the answers Facebook has filled in to my datapoints myself!