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José María Signanini
|Type||Internet Explorer add-on/extension,
Microsoft Edge add-on,
Google Chrome extension,
iOS app (browser),
Android app (browser),
Firefox for Android add-on
Ghostery is a privacy and security-related browser extension and mobile browser application. Since February 2017, it is owned by the German company Cliqz GmbH (formerly owned by Evidon, Inc., which was previously called Ghostery, Inc.).  It is distributed as proprietary freeware. The code was originally developed by David Cancel and associates.
Ghostery blocks HTTP requests and redirects according to their source address in several ways: 1) Blocking third-party tracking scripts that are used by websites to collect data on user behavior for advertising, marketing, site optimization, and security purposes. These scripts, also known as "tags" or "trackers", are the underlying technology that places tracking cookies on consumers browsers; 2) Continuously curating a "script library" that identifies when new tracking scripts are encountered on the Internet and automatically blocking them and 3) Creating "Whitelists" of websites where third-party script blocking is disabled and other advanced functionality for users to configure and personalize their experience. When a tracker is blocked, any cookie that the tracker has placed is not accessible to anyone but the user and thus cannot be read when called upon.  
Ghostery reports all tracking packages detected, and whether Ghostery has blocked them or not, in a "findings window" accessible from clicking on the Ghostery Icon in the browser. When configured, Ghostery also displays the list of trackers present on the page in a temporary purple overlay box.
When the "Ghost rank" reporting feature is enabled, Ghostery transmits the full HTML code of the page visited to Ghostery, Inc., along with statistics on which advertising distribution systems the user encounters and the speed at which these load on the page. These data are anonymized and packaged into services the company sells (see "Business model")
History and use
Originally developed by David Cancel, Ghostery was acquired by Evidon (renamed Ghostery, Inc.) in January 2010. Ghostery is among the most popular browser extensions for privacy protection. In 2014, Edward Snowden suggested consumers use Ghostery along with other tools to protect their online privacy.
In February 2017, Ghostery was acquired by Cliqz GmbH, a German company owned by Hubert Burda Media and Mozilla that builds browser technologies which emphasize privacy. Following Ghostery, Inc.'s loss of ownership, the company changed its name to Evidon, Inc..
Some say that Ghostery, Inc. plays a dual role in the online advertising industry.[weasel words] Ghostery blocks sites from gathering personal information. But it does have an opt-in feature GhostRank that can be checked to "support" them. GhostRank takes note of ads encountered and blocked, and sends that information back to advertisers so they can better formulate their ads to avoid being blocked. Though Ghostery claims that the data are anonymized, patterns of web page visits cannot truly be anonymized. Thus not everyone sees Evidon's business model as conflict-free. "Evidon has a financial incentive to encourage the program's adoption and discourage alternatives like Do Not Track and cookie blocking as well as to maintain positive relationships with intrusive advertising companies", says Jonathan Mayer, a Stanford grad student and privacy advocate.
The company that owned Ghostery, Ghostery, Inc. (previously Evidon), plays a dual role in the online advertising industry. Ghostery blocks marketing companies from gathering website user information, but it makes money from selling page visit, blocking, and advertising statistics to corporations globally, including corporations that are actively engaged in collecting user information to target ads and other marketing messages to consumers.
Customers include advertising industry groups like Better Business Bureau (BBB) and the Direct Marketing Association, parts of the Digital Advertising Alliance (DAA). These agencies then use those reports to monitor how online behavioral advertisers operate and, when needed, refer them to the Federal Trade Commission. Ghostery also offers data to university students, researchers, and journalists to support their work.
According to some journalists, Ghostery is not transparent in how it collects data from users or what that data is used for. Other journalists have claimed that Ghostery sells user data to advertisers to better target their ads. Ghostery, Inc. denies this, asserting that Ghostery does not collect any information that could be used to identify users or target ads specifically at individual users. To support their assertion, the company made the source code open for review in 2010, but after 2010 further source have not been released.
- Ad blocking; most ad blockers provide tracking protection
- Browser extension
- Online advertising
- Disconnect Mobile, an open source application developed by Brian Kennish and Casey Oppenheim designed to stop non-consensual third party trackers
- DoNotTrackMe, a free-of-charge browser extension for blocking trackers on the Internet developed by Abine
- Privacy Badger, open-source browser extension created by the EFF that blocks advertisements and tracking cookies
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