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US stocks slumped overnight, pressuring the Dow Jones Industrial Average near to a four-month low, as political concerns in Greece continued to cloud the outlook for the global economy.

Facebook has set the price range for its shares in what will be Silicon Valley's largest IPO, giving the social network a market value close to that of Amazon.

Facebook will permanently stop trading of its stock on private secondary markets at the end of this week ahead of its initial public offering in May, the FT reports.

TECHNOLOGY

The upcoming flotation of the social networking site is gaining plenty of column inches but should you be backing its IPO? Here industry experts reveal whether it is really worth all the hype.