The creative industries of media, advertising and communications contribute billions to the UK economy and employ more than half a million people.
But who's making all that happen? We've put together a list of the leaders, the influencers, the movers and shakers, and the people creating a world-leading industry who have most clout on social media.
Our media powerlist is based on active users of Twitter and their Klout scores, which takes into account various metrics from Twitter, Facebook, Google Plus, LinkedIn, Instagram, Foursquare and Wikipedia.
The influencer list is an almost real-time run down of the most important people in media, advertising and communications on social media, which is automatically updated on a weekly basis.
Should you be on City A.M.'s media powerlist? Hit the "join" button below to get started. Please remember this is a UK-based list of individuals and that City A.M. reserves the right to not accept or exclude people from the list as it deems appropriate.
This list is no longer being updated. It was last updated on October 29th.