Saudi infiltration of Twitter
In 2014 and 2015, a team of Saudi agents allegedly stole proprietary and sensitive personal data from the American social media platform Twitter, in order to unmask anonymous dissidents of Saudi Arabia. Email addresses, phone numbers, internet IP addresses, dates of birth and a history of all the users' activity of Saudi dissidents, opponents and others, were among the stolen materials.
Source: Wikipedia — Saudi infiltration of Twitter (CC BY-SA 4.0)