(Telecompaper) Kantar Media has unveiled the UK's official Twitter metric for measuring Twitter TV audience engagement. Developed with Twitter as part of a global partnership announced last year, the new Kantar Twitter TV Ratings tools will be available from mid-October. The new tool brings together geofiltered UK Twitter data and the audience research expertise of Kantar Media to enable broadcasters, media agencies and advertisers to track exactly how Twitter amplifies the power of television. New metrics will include unique authors (people Tweeting) and their affinity to brands, channels and programmes, unique audience (the number of people who viewed Tweets related to programmes) and impressions (the number of times a Tweet or Retweet has been seen about a programme). It will also include existing metrics such as the number of Tweets and Retweets about a programme before, during and after transmission, the volume and average number of Tweets per minute for programmes.