Twittering on the trading floor

Twitter started out as just another social media site for people to share too many things about themselves. The concept is simple - users type in short text messages ('tweets') of no more than 140 characters in length. They then choose other users to 'follow', hope others will follow them back, and gradually build up a network. There are still people who like to use it to announce they are having a cup of tea, but increasingly - particularly in the past month it seems - people are discovering