Educational

Nearly 700,000 Facebook users were subjects of a research study where researchers changed randomly selected users' newsfeeds to be more positive or negative to study whether those users then displayed a more positive or negative affect in response. The experiment showed the power of Facebook's control over the News Feed and the algorithms that determine which of the possible pieces of content shows up at the top at any given moment.

In 2012, Facebook CEO Mark Zuckerberg's sister, Randi, tweeted to fellow Twitter user Callie Schweitzer that Schweitzer had violated her privacy by posting a picture taken in her kitchen. Randi Zuckerberg, the former head of Facebook's marketing department, had posted the picture, which was taken in

In November 2011, the US Federal Trade Commission charged Facebook with repeatedly breaking the privacy promises it made to users. Among the list of deceptive practices and incidents in the FTC's complaint were December 2009 changes Facebook made to its site that publicly exposed information users

In June 2011, Facebook enabled an automatic facial recognition called "Tag Suggestions" based on its research project DeepFace, requiring users who objected to opt out. The feature scanned the faces in newly uploaded photographs and compared them to those in the billions of images already on the

In early 2011, Facebook launched "Sponsored Stories", an advertising product that used content from members' posts inside ads displayed on the service. Drawing on Likes, check-ins, and comments, a Sponsored Story might use a member's photograph and their comments from a coffee shop to create an ad

In October 2010, the Wall Street Journal discovered that apps on Facebook were sending identifying information such as the names of users and their Friends to myriad third-party app advertising and internet tracking companies. All of the ten most popular Facebook apps, including Zynga's FarmVille

In September 2007, Facebook, which from its 2004 founding had stressed the privacy of its user profiles and interactions, opened up its profiles to public search engines such as Google and Bing. Facebook's new "public listing search" allowed anyone to search for a particular person; such searches

In July 2009 after an in-depth study of the site spurred by complaints from the Canadian Internet Policy and Public Interest Clinic at the University of Ottawa, Canada's Privacy Commissioner issued a ruling that Facebook was in direct violation of the country's privacy laws. Among the regulator's

In April 2010, Facebook launched a set of tools to enable websites to add a social layer by adding a Facebook frame to their pages. The company's three launch partners, Microsoft's Docs.com, Yelp, and Pandora, had access to a more comprehensive tool, Instant Personalization, which allowed them to

When journalist Alex Hern needed to set up a Facebook account in order to manage the Guardian's technology page and other work-related things, he locked down its privacy settings so that the account's profile would not appear in searches and only Friends of Friends could add him as a friend. In

In November 2007, Facebook launched Beacon, an advertising programme that allowed third-party sites to include a script that passed Facebook notifications about users' activities on their sites such as purchases, auction bids, reviews, and game-playing. The service as originally designed offered no

In February 2008, users discovered that deleting their account from Facebook does not entirely remove it. Instead, the company's servers retained copies of the information in those accounts indefinitely even after those users telephoned the company to request full removal. The company argued that

In May 2009, University of Cambridge computer science researcher Joseph Bonneau discovered as part of his research that many social network respond to user requests to delete photographs by hiding them while remaining them on their servers. Among the worst offenders were Facebook, MySpace, Bebo, and

In 2006, Facebook redesigned its system to add News Feed and Mini-Feed features, which the company said were intended to give users information about their social world. The News Feed was designed to provide a constantly updated stream of stories including updates from each user's Friends and

Over the years from 2005, when Facebook was still known as "Thefacebook" and its membership was still limited to verifiable Harvard students, to 2010, Facebook changed its privacy policies many times. Over that time, the default circle of who could view users' data widened over time, first to

The first iteration of Facebook, which then-student Mark Zuckerberg launched at Harvard University in 2003, was known as "Facemash", and was based on a popular website of the day, Am I Hot or Not? Using photographs of students scraped from those collected by the university's houses of residence, the