Facebook founder Mark Zuckerberg
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Facebook shares due for stock market floatation

18 May 2012 Last updated at 08:19 BST

Shares in the social networking site Facebook are going on sale, in one of the biggest floatations ever seen on world stock markets.

Shares will be sold at $38 (£24) each, meaning that Facebook is valued at $104bn (£66bn).

The website has transformed the way in which hundreds of millions of people communicate, but questions remain about its ability to generate profit.

Rory Cellan-Jones reports.