Poll

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Facebook statistics - more than 300 million active users. More than 2 billion pieces of content shared each week. source - []

Twitter statistics - Pingdom estimates between 557,000 and 1.8 million tweets per hour. About 27.3 million tweets per day. In Oct 2009, the 5 billionth tweet was posted. source - []

Wikipedia is a widely used reference site attracting more than 65 million visitors each month from around the world. source - []