Web 2.0 refers to improvements in the World Wide Web that allow for increased user collaboration and sharing of information online, through features like blogs, social networking, and web applications. Mediation refers to how media alters reality when portraying people or events, as it presents a version rather than direct reality. Proliferation is a sudden increase in the amount of media, while saturation describes society being completely immersed in media to the point of it influencing daily life and consumer decisions.