Social networking sites are unquestionably the key phenomenon of the Web 2.0. Their social impact is colossal, bridging the gaps between communities, wiping away physical borders to enable people and businesses to socialise, exchange and create. In 2009, the World Wide Web could be counting more than one billion social networkers, which represents more than half of all the Internet users. Last month, Facebook hit the 300 million users mark. If Facebook was a country, it would be the fourth largest country in the world, pointed out its CEO Mark Zuckerberg. QZone, the Chinese site, claims to have an even higher amount of users, while sites like Twitter and LinkedIn each reaches about 50 million users. And this is to name only a few of them.

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