There is a glimpse – but only a glimpse – of the future in this post by the BBC’s Rory Cellan-Jones on new ways of measuring new media political comment on the leaders TV debates during the election. The bar graph below shows an example of Twitter sentiment during the the third debate, on the economy.

Lexalytics on 3rd party leaders debate
Two thoughts occur straight away.
1) The methods for measuring the flows of messages, tweets and posts are going to get much better pretty quickly. Since networks are potentially influential, people trying to track and explain opinion changes will have to analyse what happens in social networks such as Twitter. The early techniques listed just sound a bit primitive.