December 2018: Facebook comes under fire after a bombshell report discovered the firm allowed over 150 companies, including Netflix, Spotify and Bing, to access unprecedented amounts of user data, such as private messages.
Some of these 'partners' had the ability to read, write, and delete Facebook users' private messages and to see all participants on a thread.
It also allowed Microsoft's search engine, known as Bing, to see the name of all Facebook users' friends without their consent.
Amazon was allowed to obtain users' names and contact information through their friends, and Yahoo could view streams of friends' posts.
As of last year, Sony, Microsoft, and Amazon could all obtain users' email addresses through their friends.
September 2018: Facebook disclosed that it had been hit by its worst ever data breach, affecting 50 million users - including those of Facebook boss Mark Zuckerberg and COO Sheryl Sandberg.
Attackers exploited the site's 'View As' feature, which lets people see what their profiles look like to other users.
Facebook says it has found no evidence 'so far' that hackers broke into third-party apps after a data breach exposed 50 million users (stock image)
The unknown attackers took advantage of a feature in the code called 'Access Tokens,' to take over people's accounts, potentially giving hackers access to private messages, photos and posts - although Facebook said there was no evidence that had been done.
The hackers also tried to harvest people's private information, including name, sex and hometown, from Facebook's systems.
Facebook said it doesn't yet know if information from the affected accounts has been misused or accessed, and is working with the FBI to conduct further investigations.
However, Mark Zuckerberg assured users that passwords and credit card information was not accessed.