Facebook shares slumped to more than 10 per cent below their float price on their second day trading as a public company.

Eyewitness: There are droves of old-school peace activists and war veterans, but many of the younger attendees have a broader economic agenda

Facebook founder and chief executive Mark Zuckerberg updated his status to “married”.

US Outlook Whatever Jamie Dimon says, JPMorgan Chase's employees don't think the Volcker Rule is a waste of time. The company's chief executive has mocked and mocked and mocked the new rule that bans proprietary trading in Wall Street banks – which is why he is so angry with himself for failing to spot that his own proprietary traders had put on a bet which could blow a $4bn hole in JPMorgan's profits.

And he is...?

Markets slid on the news today that coalition government talks in Greece have failed after nine days of discussions, meaning the country is heading for another election next month.

Pressure mounted yesterday on Jamie Dimon, the chief executive of JP Morgan, the investment bank which last week revealed a $2bn (£1.2bn) trading loss through its London office.

Poor figures hint at slowdown in America's recovery as elections loom in France and Greece

NYSE Euronext, the shares and futures exchanges group, saw its profits plunge 44 per cent in the first three months of this year as its was hit by the costs of its blocked merger with Deutsche Börse and lower trading volumes in the US.

Angela Merkel's agenda of forcing through austerity programmes from Athens to Dublin faced its toughest test yet with the success of François Hollande in the first round of French presidential elections.

Austerity strategy poised on a knife-edge as Socialists look set to storm the Elysée Palace

Staff at Goldman Sachs have been put on notice to expect more cuts to their bonuses this year, after the bank slashed payments to its bonus pool in the first three months of 2012.

Burger King, the fast food giant, is returning to the public stock market, with the help of a UK-listed shell company whose star-studded board includes men with nicknames such as “The Homeless Billionaire”, “The Silver Fox” and “Doctor Doom”.

Mack the Knife?