Historical, contemporary, and future trajectory of the technology.

Describe the history and background of tumblr. When and how did it emerge and develop? What were its predecessors? When and how did it take off and become popular? Who are its major competitors? 

Discuss of the future of the technology. How might it evolve and change over time? Will it survive and thrive much longer or is it in decline? Why? – include a case study as an example with sources sited within the text