Convergence Culture is a term coined by Henry Jenkins in his 2006 book with the same title. The term is used to describe a new era where 'new and old media collide'. It especially refers to how media consumers understand and make use of the new forms of media and it’s content.
This convergence has created such things as Web 2.0, transmedia phenomena, and subsequently a new definition of American popular culture. As the book describes, this convergence can have both positive and negative effects. Despite many exciting, new creations that have resulted, there are also conflicts when opposing ideologies collide.
(Jenkins, Henry. Convergence Culture. New York City; London: New York University Press, 2006.)