Big brother is watching you. But that doesn't mean you can't do something about it - by wresting back control of your data. Everything we do online generates information about us. The tacit deal is that we swap this data for free access to services like Gmail. But many people are becoming uncomfortable about companies like Facebook and Google hoarding vast amounts of our personal information -particularly in the wake of revelations about the intrusion of the US National Security Agency (NSA) into what we do online.
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