On Wednesday Twitter released the Year on Twitter - the story of 2012 told through our users' Tweets. The big stories were easily brought back to mind. The vivid image of Boris Johnson dancing at the Olympics created the highest spike in UK Twitter conversation, based on the number of Tweets sent per second. You may recall the episode. The most retweeted message of the year - and of all time - featured Barack Obama clutching Michelle in a robust bodily embrace.