Another Google one folks! The Buzz experiment by Google labs has been heavily criticised for its privacy. It enrolled all Gmail users and made their contacts public without seeking permission first. A group of Gmail users are now suing Google for this. Google changed this extremely quickly hand has now got to undergo a privacy investigation every year for the next 20 years!
That is the very bacics of the story, but if you want to read more, go to this BBC Article.
