In this message, Snowden is warning us about the mass-surveillance organized by the govts.
He compares it with the book 1984, written by George Orwell in 1949, a science-fiction book at the time. A famous quote is “ Big Brother is watching you”
In the book, the devices/ means used are : microphones, video cameras and TVs.
However today, technology is much more developed.We are tracked with our mobiles and we can be observed / watched with the cameras on the computers..
According to Snowden, privacy is very important .