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Facebook

Company

Facebook allows targeting of advertisements based on interests, behaviors, location, and demographics. It also allows targeting groups like website visitors, app users, and audiences that look like existing audiences. It also provides a list of companies who can assist with advertising on Facebook. including data brokers who can augment custom audience lists. Additionally, data is available via the API and some app developers collect data from users via their apps, as Global Science Research did (and then sold it to Cambridge Analytica). Similar services are also offered on Instagram.
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Acxiom

Company

Major data broker that collects data from a wide variety of sources. They sell data and match up the identities of people across data sources. Acxiom also offers consulting services to help organizations use their data. They created a website (https://aboutthedata.com) that explains how targeted advertising works and offers to let people control how their data is used, but also likely collects data in the process.
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Twitter

Company

Twitter is a social media website that also sells data and advertisements. Companies and researchers can buy data from particular accounts, coming from certain geographic areas, or about certain topics. Continuous access to various quantities of data can be purchased, or historical data can be purchased one time. A subset of this data is available for free via Twitter's API.<br />Twitter allows companies to target advertisements based on lists of accounts/emails/phone numbers, audiences like known customers or followers of other accounts, website visitors or app users, search queries, interests, devices, geographic area, purchasing behaviors (based on data from data brokers), language, or gender. Users are then shown advertisements, usually in the form of tweets, and advertisers pay based on the number of impressions, clicks, engagements, followers, etc. Twitter operates its advertisement program and sells data in most countries.

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