LONDON - AUG 19: Close-up view of Facebook notifications tabs on Aug 19, 2014 in London, UK. Facebook is the world's largest online social network services with reportedly 1.28 billion active users.
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LONDON - AUG 19: Close-up view of Facebook notifications tabs on Aug 19, 2014 in London, UK. Facebook is the world's largest online social network services with reportedly 1.28 billion active users.