Users of the Iphone, Blackberry and Gmail are among those who are supposedly 'screwed' because more than 150 organisations can monitor data on mobile devices. Assange made the statement at a press conference while unveiling the Wikileaks 'Spy Files' project.
Wikileaks said, "Mass interception of entire populations is not only a reality, it is a secret new industry spanning 25 countries."
"It sounds like something out of Hollywood, but as of today, mass interception systems, built by Western intelligence contractors, including for 'political opponents' are a reality."
Assange said, "Who here has an iPhone? Who here has a BlackBerry? Who here uses Gmail? Well, you're all screwed."
"The reality is, intelligence contractors are selling right now to countries across the world mass surveillance systems for all those products."
The organisations apparently have the ability to track devices, intercept messages and listen to phone calls, according to The Press Association.
It might sound like a complete invasion of privacy but the goings on are legal according to Assange and are leading to a "totalitarian surveillance state".
He said the US, UK, Australia, South Africa and Canada are all developing "spying systems", and the data is collected and sold on to "dictators and democracies alike".
The publication of the 'Spy Files' consisting of 287 documents in collaboration with the web site spyfiles.org is a "mass attack on this mass surveillance industry," added Assange.