Facebook advert revenue shows importance of video content

Facebook is far and away the world's biggest social network, and it just keeps getting bigger.

The company has unveiled a healthy rise in the number of people using the site around the world as well as a big jump in quarterly revenues.

Despite what Facebook boss Mark Zuckerberg said was a "strong quarter", its shares fell more than 3% in after hours trading.

So what is Facebook spending its money on?

Michelle Fleury reports.