Facebook shares rose $1.94 to close at $25.94 per share.
Rising mobile viewership is paving way for online TV subscription.
Shares of the world's No. 1 online social network soared as much as 15 per cent in extended trading before suddenly falling to $47.40, down 3 per cent from its $49.10 close.
Apple Inc unveiled a new TV set top box that responds to voice commands and fresh iPhones that sense the pressure of a finger tap, changes which underwhelmed many social media commenters and investors.
He replaces Mark Pincus, the founder of the company.