The document discusses several media theorists and concepts related to changes in media brought about by new technologies and the internet, including Web 2.0 enabling user interaction and participation, citizen journalism challenging traditional "Big Media", knowledge building communities allowing faster sharing of ideas, convergence across platforms encouraging participatory culture and collective intelligence, and the "Long Tail" theory describing how niche content is becoming more economically viable online. However, it also notes potential issues like lack of diversity on platforms like YouTube and questions around the ethics of citizen journalism.