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.