They made money in the past, as more and more users kept signing up and using the site (more new eyeballs on the display ads). We're looking to the future now. What happens when the number of new users starts to slow down? As a public company, there is increased pressure for it to perform and to grow. Increasing the enormous net worth of the CEO and some insiders and then gradually fizzling out is not, one would think, the objective of a corporation that goes public. The usual reason companies raise money through IPO's is to grow the company.
