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LONDON, ENGLAND - MARCH 25:  In this photo illustration the Social networking site Facebook is displayed on a laptop screen on March 25, 2009 in London, England. The British government has made proposals which would force Social networking websites such as Facebook to pass on details of users, friends and contacts to help fight terrorism.  (Photo by Dan Kitwood/Getty Images)
LONDON, ENGLAND - MARCH 25:  In this photo illustration the Social networking site Facebook is displayed on a laptop screen on March 25, 2009 in London, England. The British government has made proposals which would force Social networking websites such as Facebook to pass on details of users, friends and contacts to help fight terrorism.  (Photo by Dan Kitwood/Getty Images)

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Facebook's 'creepy' mood experiment

Internet users have reacted angrily to news that Facebook researchers manipulated the content some users were shown.

Facebook's 'creepy' mood experiment

Internet users have reacted angrily to news that Facebook researchers manipulated the content some users were shown.