Modern life, communication and even business relationships are difficult to imagine without social networks.
Their leader and the most famous social site worldwide is Facebook. According to statistics, each month 1 billion and 35 million people log in to the network at least once.
Facebook was launched on the 4th of February in 2004. In a few years it "infected" the whole world and became the largest virtual community. The income of the company in 2014 was 12.5 billion dollars.
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