Facebook, still a growing social media?

According to Advertising Age, even though a lot of web 2.0 start ups aren't very profitable, Facebook is continuing to make money. They just crossed the 300 million dollar mark and they are still growing.
Facebook is such a huge social media. Parents, teachers, organizations, and companies are all now joining the Facebook madness. It is not something you can escape anymore. Companies are continuing to advertise on Facebook and people are continually joining, that Facebook is not going anywhere anytime soon.
Though, as the numbers for revenue and users grow, so does the need for a bigger company. Right now, Mr. Zuckerberg says that Facebook has only 1,000 employees, one employee for every 1 million users. If this continual growth keeps up, the company is going to have to do some serious re-modeling.