April 11th, 2013Top StoryHow Facebook Uses Your Data to Target Ads, Even OfflineBy Thorin Klosowski
For most people, Facebook's advertising system is insider-baseball that doesn't really affect how we use the service. But as the targeted ads—the advertisements that take the data you provide to offer ads specific to you—get more accurate and start pulling in information from other sources (including the stuff you do offline), it's more important than ever to understand their system. To figure out how this all works, I spoke with Elisabeth Diana, manager of corporate communication at Facebook. Let's kick it off with the basics of how the targeted ads work online before moving on to some of the changes we'll see with the recent inclusion of offline shopping data. How Facebook Uses Your Profile to Target Ads
The most obvious example of a targeted ad uses something you like—say Target—and then shows an ad on the right side or in the newsfeed that simply says, "[Name] likes Target." What you and your friends like helps determine what everyone on your friends list sees for ads. Any ad you click on then increases the likelihood of another similar ad. It's not just what you and your friends are doing that generates ads though; it's also basic demographic information. Diana notes that this also includes "major life events like getting engaged or married." So, if you're recently engaged and note that on Facebook, you'll see ads about things like wedding planning. When an advertiser creates an ad on Facebook, they can select all sorts of parameters so they reach the right people. A simple example of a parameter would be: "Someone engaged to be married, who lives in New York, between the ages of 20-30." That's simple, but advertisers can actually narrow that down to insane specifics, like "Someone engaged to be married, who lives in New York, between the ages of 20-30, who likes swimming, and who drives a BMW." If your profile fits those parameters, you'll likely see the ad. If you want to see how it works, you can even try your hand at creating an ad. It boils down to this: the more information you put about yourself on Facebook—where you live, your age, where (and if) you graduated college, the companies, brands, and activities you like, and even where you work—determines what kind of ads you'll see. In theory, it makes it so targeted ads are more relevant to you. What Happens When You Don't Like or Share Anything
Chances are, even a barebones profile has a few bits of information about you. You probably at least have where you live and your age. That combined with the information your friends provide creates a reasonable demographic that advertisers can still reach you at. The ads won't be as spookily accurate to you as if you provide a lot of data, but they'll at least be about as accurate as a television ad on your favorite show. How to Keep Facebook from Targeting Ads Online
Finally, you want to opt out of the Facebook Ads that use your actions (liking a page, sharing pages, etc) to promote ads to your friends:
So, that takes care of the online advertising. Be sure to check out our guide to Facebook privacy for more information about all that. You can also hide your likes from your profile so they're not as prominant. If you don't actually mind the advertising, but want to improve the ads shown to you, you can always click the "X" next to any ad to get rid of it. How Facebook Uses Your Real World Shopping to Target Ads
To do this, Facebook is combining the information they have with information from data collection companies like Datalogix, Acxiom, Epsilon, and BlueKai. These companies already collect information about you through things like store loyalty cards, mailing lists, public records information (including home or car ownership), browser cookies, and more. For example, if you buy a bunch of detergent at Safeway, and use your Safeway card to get a discount, that information is cataloged and saved by a company like Datalogix. How much do these data collecting companies know? According to The New York Times: way more than you'd think, including race, gender, economic status, buying habits, and more. Typically, they then sell this data to advertisers or corporations, but when it's combined with your information from Facebook, they get an even better idea of what you like, where you shop, and what you buy. As Diana describes it, Facebook is "trying to give advertisers a chance to reach people both on and off Facebook," and make advertisements more relevant to you. Photo by Joe Loong. How Real-Life Ad Targetting Works
Custom audiences are very simple and it basically allows an advertiser to upload an email list and compare that data (privately) with who's on Facebook. Diana offered the simple example of buying a car. Let's say you purchase a car from a dealership, and when you do so, you give them your email address. That dealership wants to advertise on Facebook, so they upload a list of all the email addresses they have. That data is then made private, and Facebook pairs the email address with the one you registered on Facebook. If they match, you might see an ad from that dealership on Facebook for a discounted tune-up or something similar. Additionally, Lookalike audiences might be used to advertise to people similar to you because you purchased a car there. That might mean your friends (assuming you're all similar) will see the same ad from the dealership. The custom audiences can be used by any company advertising on Facebook. So, if you're on your dentist's email list, or that small bakery around the corner snagged your email for a free slice of pie, they can potentially reach you through this system. The partnership with other data collection agencies like Acxiom and Datalogix is going to look a little different. This means that when you use something like a customer loyalty card at a grocery store, you might see a targeted ad that reflects that. The New York Times offers this example:
A new targeting feature, Partner categories, takes the data collected by these third-party data brokers and puts you into a group. So, if you're in a group of people who buys a lot of frozen pizza at Safeway, you'll see ads for frozen pizza, and maybe other frozen foods. It sounds a little weird at a glance, but it's important to remember that this is all information that you're already providing. Facebook is using data collected by outside companies to create a more accurate portrayal of you so marketers can advertise to you directly. How Your Data Is Kept Private
First, your personal information like email and name is encrypted. So, your name, login info, and anything else that would identify you as a person goes away. Then, Facebook turns the rest of the information into a series of numbers and letters using hashing. For example, Age: 31, Likes: Lifehacker, Swimming, BMW's, Location: New York, turns into something like, "342asafk43255adjk." Finally, this information is combined with what the data collection companies have on you to create a better picture of your shopping habits so they can target ads. Slate describes the system like so:
From the actual advertisers point of view, the flow of information doesn't reveal personal details. It just tells them how many potential customers might see an ad. "An advertiser would learn something like, 'about 50% of your customers are on Facebook,'" says Diana, "But they don't know who you are." Image by Jorge Stolfi. How to Opt Out of Offline Targetting
This process is a lot more complicated than it should be, but the Electronic Frontier Foundation has a step-by-step guide for each of the data brokers. Basically, you'll need to opt out in three different places: Acxiom, Datalogix, and Epsilon in order to ensure your shopping data in the real world isn't used on Facebook (and beyond). BlueKai, unfortunately, has no direct way to opt out so you'll need to use the browser extensions listed in the first section. If you really want to keep those loyalty cards from tracking you, just use Jenny's number (867-5309) at the checkout lane instead of setting up an account. Those are the basics of how Facebook's various targeted advertising systems work. Of course, a lot of complex math and algorithms are in place to actually generate this data, but it really boils down to how much information you're making public—whether you're aware of it or not—that makes the system tick. If you like the targeted ads, they should improve even more as the years go on. If you don't, opting out is always an option.  |
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