This piece in Recode explains that Cambridge Analytica built an app that 270,000 people used to amass profiles on 50 million people.
That’s not very surprising because we are talking about networks here.
This is a network graph that my colleague Jacqueline made of my twitter network a few years ago:
In our online life, we are connected to a huge number of people.
If I get access to your email inbox, I am going to see emails with thousands of people.
Which is what makes this privacy/data sovereignty stuff so important.
When your data is taken without your knowledge/permission, it is not just your data that is taken.
It is the data of thousands of other people, often the people closest to you.