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The World Wide Web has transformed retailing, communications, and social lives, with sites like Google and Facebook now household names. What鈥檚 more we take it for granted that most such sites we visit are free of charge. But does 鈥渇ree鈥� come at a price after all? In this week鈥檚 edition of 鈥淭he Virtual Revolution鈥� Doctor Aleks Krotoski considers the implications of a commercialised web for privacy - finding that among other things, we鈥檙e all being watched as we shop, network and send emails.