The infographic is wrong. Facebook took 21 months from launch to reach 25 million users. Facebook did not reach the 200 million users mark until April 8, 2009, almost five years after its initial launch.
There is an additional error in the underlying assumption of the inforgraphic which compares media such as TV, Radio and the internet and their adoption with Facebook. Adoption levels in the first tier of technologies is governed by a spending limit governed by disposable income (i.e. someone had to buy a Radio, a TV, a Computer AND an ISP subscription) - Facebook, on the other hand, like all social networks relies on an online population - there is no cost to joining it, therefore a major impediment to potential growth is removed.