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Facebook

Launched in February 2004, Facebook is a social networking service founded by Mark Zuckerberg with his college roommates and fellow students Eduardo Saverin, Andrew McCollum, Dustin Moskovitz and Chris Hughes. Early investors included Microsoft and Hong Kong tycoon Li Ka- shing, through his namesake charitable foundation.

Twitter's user growth fell in every quarter last year. Photo: AFP

Twitter's stock falls 18 per cent on paltry growth in users

Twitter reported its slowest pace of user growth in recent history, dimming hopes the social media phenomenon can sustain its torrid pace of expansion and wiping out nearly a fifth of the company's value in after-hours trading.