if facebook is at a growth stops phase, it's possible it's because they've almost saturated their target market. They have something like 1.5 billion users. Tha

if facebook is at a growth stops phase, it's possible it's because they've almost saturated their target market. They have something like 1.5 billion users. That's Billion, with a B. How many of those dead services you mentioned ever had 1.5 billion users?