Почему ваши друзья массово удаляются с фейсбука? Потому что не читают пользовательское соглашение и авторуют разные левые приложения.
"In June 2014, a researcher named Aleksandr Kogan developed a personality-quiz app for Facebook. It was heavily influenced by a similar personality-quiz app made by the Psychometrics Centre, a Cambridge University laboratory where Kogan worked. About 270,000 people installed Kogan’s app on their Facebook account. But as with any Facebook developer at the time, Kogan could access data about those users or their friends. And when Kogan’s app asked for that data, it saved that information into a private database instead of immediately deleting it. Kogan provided that private database, containing information about 50 million Facebook users, to the voter-profiling company Cambridge Analytica. Cambridge Analytica used it to make 30 million “psychographic” profiles about voters."
www.google.com/amp/s/www.theatla
The Cambridge Analytica Scandal, in 3 Paragraphs
What it means for Facebook, for President Trump’s world, and for every American