Shares rise on news that company is testing adverts that automatically start playing without sound
Facebook says it has been testing the silent auto-playing videos for video content shared between Facebook users since September and has seen a 10% increase in the number of videos users watch, like, share and comment on.
Advertising has helped Facebook achieve enormous growth in recent years. Its revenue grew from $3.71bn in 2011 to $5.09bn in 2012, and to $5.29bn (£3.25bn) in the first nine months of this year.
