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Say you’re scrolling through your Facebook Newsfeed and you encounter an ad so eerily well-suited, it seems someone has possibly read your brain.

Maybe your mother’s birthday is coming up, and Facebook’s showing ads for her local florist. Or maybe you just made a joke aloud about wanting a Jeep, and Instagram’s promoting Chrysler dealerships.

Whatever the subject, you’ve seen ads like this. You’ve wondered — maybe worried — how they found their way to you.

[How Facebook is slowly eating the rest of the Internet]

Facebook, in its omniscience, knows that you’re wondering — and it would like to reassure you. The social network just revamped its <a href="https://www.facebook.com/ads/preferences/?entry_product=ad_settings_screen">ad preference settings</a> to make them significantly easier for users to understand. They’ve also launched <a href="https://www.facebook.com/ads/about/?entry_product=ad_preferences">a new ad education portal</a>, which explains, in general terms, how Facebook targets ads.

“We want the ads people see on Facebook to be interesting, useful and relevant,” a Facebook spokesperson said.

But it remains to be seen whether users are pleased or frightened by the new information they suddenly have.

Targeting options for Facebook advertisers* 
1. Location 
2. Age 
3. Generation 
4. Gender 
5. Language 
6. Education level 
7. Field of study 
8. School 
9. Ethnic affinity 
10. Income and net worth 
11. Home ownership and type 
12. Home value 
13. Property size 
14. Square footage of home 
15. Year home was built 
16. Household composition

*Not <a href="https://www.facebook.com/ads/manager/creation/creation/?act=25767906&amp;pid=p1">even conclusive</a>!

As explained on that shiny new portal, Facebook keeps ads “useful and relevant” in four distinct ways. It tracks your on-site activity, such as the pages you like and the ads you click, and your device and location settings, such as the brand of phone you use and your type of Internet connection. Most users recognize these things impact ad targeting: Facebook has repeatedly said as much. But slightly more surprising is the extent of Facebook’s web-tracking efforts and its collaborations with major data brokers.

While you’re logged onto Facebook, for instance, the network can see virtually every other website you visit. Even when you’re logged off, Facebook knows much of your browsing: It’s alerted every time you load a page with a “Like” or “share” button, or an advertisement sourced from its Atlas network. Facebook also provides publishers with a piece of code, called Facebook Pixel, that they (and by extension, Facebook) can use to log their Facebook-using visitors.

17. Users who have an anniversary within 30 days 
18. Users who are away from family or hometown 
19. Users who are friends with someone who has an anniversary, is newly married or engaged, recently moved, or has an upcoming birthday 
20. Users in long-distance relationships 
21. Users in new relationships 
22. Users who have new jobs 
23. Users who are newly engaged 
24. Users who are newly married 
25. Users who have recently moved 
26. Users who have birthdays soon 
27. Parents 
28. Expectant parents 
29. Mothers, divided by “type” (soccer, trendy, etc.) 
30. Users who are likely to engage in politics 
31. Conservatives and liberals 
32. Relationship status

On top of that, Facebook offers marketers the option to target ads according to data compiled by firms like Experian, Acxiom and Epsilon, which have historically fueled mailing lists and other sorts of offline efforts. These firms build their profiles over a period of years, gathering data from government and public records, consumer contests, warranties and surveys, and private commercial sources — like loyalty card purchase histories or magazine subscription lists. Whatever they gather from those searches can also be fed into a model to draw further conclusions, like whether you’re likely to be an investor or buy organic for your kids.

When combined with the information you’ve already given Facebook, through your profile and your clicks, you end up with what is arguably the most complete consumer profile on earth: a snapshot not only of your Facebook activity, but your behaviors elsewhere in the online (and offline!) worlds.

33. Employer 
34. Industry 
35. Job title 
36. Office type 
37. Interests 
38. Users who own motorcycles 
39. Users who plan to buy a car (and what kind/brand of car, and how soon) 
40. Users who bought auto parts or accessories recently 
41. Users who are likely to need auto parts or services 
42. Style and brand of car you drive 
43. Year car was bought 
44. Age of car 
45. How much money user is likely to spend on next car 
46. Where user is likely to buy next car 
47. How many employees your company has 
48. Users who own small businesses 
49. Users who work in management or are executives

These snapshots are <a href="http://www.schirn.de/en/magazine/context/sara_m_watson_bits_of_me_essay/">frequently incomplete and flawed</a>, we should note — after all, they rely on lots of assumptions. But generally speaking, they’re good enough to have made Facebook an advertising giant. In the second quarter of 2016, the company made $6.4 billion in advertising, a number that’s up 63 percent from the year before. And now, Facebook ads aren’t only on Facebook.com and its acquired apps — they also populate an external Audience Network.

“Speaking as both a consumer and as an advertiser, I think that Facebook’s ad capabilities make internet advertising a better experience overall,” said Kane Jamison, a Seattle-based marketer who has written about his experience with Facebook ads. “The majority of promoted topics that I see in my Facebook feed are relevant to my interests, and they’re worth clicking on more often.”

Not everyone is quite so convinced that Facebook’s targeting methods are benevolent, though. Peter Eckersley, the chief computer scientist at the Electronic Frontier Foundation, calls them “the most invasive in the world.”

Yes, he acknowledges, many companies use data brokers to make direct-mail lists, and almost every website utilizes some kind of tracker or cookies — but no company on earth, save Facebook, bundles all that information.

50. Users who have donated to charity (divided by type) 
51. Operating system 
52. Users who play canvas games 
53. Users who own a gaming console 
54. Users who have created a Facebook event 
55. Users who have used Facebook Payments 
56. Users who have spent more than average on Facebook Payments 
57. Users who administer a Facebook page 
58. Users who have recently uploaded photos to Facebook 
59. Internet browser 
60. Email service 
61. Early/late adopters of technology 
62. Expats (divided by what country they are from originally) 
63. Users who belong to a credit union, national bank or regional bank 
64. Users who investor (divided by investment type) 
65. Number of credit lines

Take the example of the ad for your mother’s local florist: that might have been targeted to women from your hometown (which you’ve told Facebook) whose mothers’ birthdays are coming up (that’s in your Facebook calendar), who live away from family (based on off-site activity) and who have a high estimated income (according to Acxiom).

Or the mystery of the spoken Jeep joke and displayed the car ad — an adjacency that <a href="http://wfla.com/2016/05/20/talker-is-facebook-listening-to-your-conversations/">actually happened on local Florida TV</a>, convincing one newscaster that Facebook “eavesdropped” on her. Facebook actually sources data from IHS Automotive, an industry intelligence firm used widely by dealers, banks and financial analysts, and doesn’t need eavesdropping to know that your car’s 10 years old and you might be back in the auto market.

“Facebook’s business model is to amass as much first-party and third-party data on you as possible, and slowly dole out access to it,” Eckersley said. “If you’re using Facebook, you’re entrusting the company with records of everything you do. I think people have reason to be concerned about that.”

66. Users who are active credit card users 
67. Credit card type 
68. Users who have a debit card 
69. Users who carry a balance on their credit card 
70. Users who listen to the radio 
71. Preference in TV shows 
72. Users who use a mobile device (divided by what brand they use) 
73. Internet connection type 
74. Users who recently acquired a smartphone or tablet 
75. Users who access the Internet through a smartphone or tablet 
76. Users who use coupons 
77. Types of clothing user’s household buys 
78. Time of year user’s household shops most 
79. Users who are “heavy” buyers of beer, wine or spirits 
80. Users who buy groceries (and what kinds) 
81. Users who buy beauty products 
82. Users who buy allergy medications, cough/cold medications, pain relief products, and over-the-counter meds

Eckersley’s main concern is how much consumers know about all this tracking — and how much they’re able to opt out of it. Facebook says it’s been transparent on both counts, and that the revamped ad preferences dashboard, as well as the long-standing “Why Am I Seeing This Ad?’ dropdown, is only the latest proof that it’s dedicated to user privacy.

But while both the dashboard and the dropdown will rid you of ads you don’t like, neither actually lets users opt out completely of any of Facebook’s four tracking methods. The preferences manager, for instance, lets users tell Facebook they don’t have certain interests that the site has associated with them or their behavior, but there’s no way to tell Facebook that you don’t want it to track your interests, at all.

Likewise, Facebook allows users to opt-out of advertisements based on their use of outside websites and apps. But that doesn’t mean that Facebook never tracks those people when they’re on other sites, Eckersley said: It just limits some of its more all-seeing methods. And while Facebook did push its data-broker partners to adopt better privacy measures when it began working with them in 2013, each broker still requires you to file an opt-out request with them individually.

83. Users who spend money on household products 
84. Users who spend money on products for kids or pets, and what kinds of pets 
85. Users whose household makes more purchases than is average 
86. Users who tend to shop online (or off) 
87. Types of restaurants user eats at 
88. Kinds of stores user shops at 
89. Users who are “receptive” to offers from companies offering online auto insurance, higher education or mortgages, and prepaid debit cards/satellite TV 
90. Length of time user has lived in house 
91. Users who are likely to move soon 
92. Users who are interested in the Olympics, fall football, cricket or Ramadan 
93. Users who travel frequently, for work or pleasure 
94. Users who commute to work 
95. Types of vacations user tends to go on 
96. Users who recently returned from a trip 
97. Users who recently used a travel app 
98. Users who participate in a timeshare

There is another option, of course: If Facebook tracking freaks you out, simply don’t use it. There are people who want targeted, “relevant” ads — and there are others, like Eckersley, who can’t stomach it.

But wait, what was that? Eckersley has Facebook? Surely hell just froze over.

“It’s the paradox of modern life,” he laughed, adding that he needs the site to keep in touch with friends and family. “We’re strongly incentivized, by the culture around us, to use this technology. It’s incredibly useful — and an incredibly giant structural problem for our privacy.”

<a href="https://www.washingtonpost.com/news/the-intersect/wp/2016/05/20/what-we-really-see-when-facebook-trending-picks-stories-for-us/?itid=lk_inline_manual_46">What we really see in Facebook Trending</a>

<a href="https://www.washingtonpost.com/news/the-intersect/wp/2016/04/08/facebook-is-trying-to-get-its-users-to-share-more-about-their-personal-lives/?itid=lk_inline_manual_47">Why Facebook wants its users to ‘share’ more</a>

<a href="https://www.washingtonpost.com/news/the-intersect/wp/2016/06/09/creepy-startup-will-help-landlords-employers-and-online-dates-strip-mine-intimate-data-from-your-facebook-page/?itid=lk_inline_manual_48">Creepy startup collects your online information for dates, employers and landlords</a>

Syracuse University, BA in magazine journalism, international relations and Spanish

Caitlin Dewey is The Washington Post's food policy writer for Wonkblog. She previously covered digital culture and technology for The Post.