Twitter's $1bn IPO: key points $253.6m - Revenue so far in 2013 65pc - Amount of revenues derived from mobile users $80m - Twitter's net loss in 2012 $69.3m - Twitter's loss in first six months of 2013 TWTR = Symbol Twitter will trade under on the stock exchange 2006 - Year Twitter was founded 4.7pc - Stake held by Twitter creator Jack Dorsey 12pc - Stake held by co-founder Evan Williams