Facebook shares drop below flotation price

On its second day of trading as a public company Facebook's share price has dropped sharply.

When the shares first went on sale last Friday the company was valued at over $100bn (more than £60bn).

Despite the wider market in a buoyant mood, Facebook slid 12% immediately at the opening bell the following Monday.

The BBC's Technology Correspondent Rory Cellan-Jones explains what that means for the company.