Have you heard of MySpace? I had, once upon a time. Now, it seems to be off the grid. Facebook on the other hand has been making a progressive march to the sea and is taking no prisoners. In February of 2007, Facebook reported 18M users, up from 7.5M 7 months earlier. (Edited) Toronto claims 1 in 10 Torontonians as Facebook users (approximately the size of the Baltimore City population).
Facebook’s success has not been overnight. When it began, it was created as a closed social network for primarily high school and college students. Users would be able to join Facebook if they had a valid email address from a registerd University or other school. There was a smaller percentage of workplace networks where users could join if they had a valid company email address, but by and large these networks were much smaller due to reluctance of companies to join the social media revolution and risk employee productivity losses.