Andreas Kaplan
In particular his 2010 article "Users of the world, unite! The challenges and opportunities of social media" published in Business Horizons is widely cited and known in the field. This seminal article recurrently achieved first place in Science Direct's annual list of the 25 most downloaded publications across all 24 core subject areas covered in Science Direct and thus was downloaded more often than any other of the approximately 13.4 million papers in the collection.